Below a list of the known partition IDs (system indicators) of the various operating systems, file systems, boot managers, etc. For the various systems, short descriptions are given, in the cases where I have some info. There seem to be two other major such lists: Ralf Brown's (see interrupt list under Int 19) and Hale Landis' but the present one is more correct and more complete. (However, these two URLs are a valuable source for other information.) See also the old Powerquest table and the specification for DOS-type partition tables.
Copyright (C) Andries E. Brouwer 1995-2012. Link to this list - do not copy it. It is being updated regularly. Additions, corrections, explanations are welcome. (Mail to email@example.com.)
To be precise: this is not used to designate unused area on the disk, but marks an unused partition table entry. (All other fields should be zero as well.) Unused area is not designated. Plan9 assumes that it can use everything not claimed for other systems in the partition table.
DOS is a family of single-user operating systems for PCs. 86-DOS (`QDOS' - Quick and Dirty OS) was a CP/M-like operating system written by Tim Paterson of Seattle Computer Products (1979). Microsoft bought it, renamed it to MS-DOS 1.0 and sold it to IBM (1980) to be delivered together with the first IBM PCs (1981). MS-DOS 2.0 (1983) was rather different, and designed to be somewhat Unix-like. It supported a hard disk (up to 16MB; up to 32MB for version 2.1). Version 3.3+ added the concept of partitions, where each partition is at most 32MB. (Compaq DOS 3.31 relaxed this restriction.) Since version 4.0 partitions can be 512 MB. Version 5.0 supports partitions up to 2 GB. Several clones exist: DR-DOS (from Digital Research, later part of Novell and called NovellDOS or NDOS, then owned by Caldera and called OpenDOS, then by its subsidiary Lineo who named it back to DR-DOS. See http://www.drdos.com/), PC-DOS (from IBM), FreeDOS, ... See Types of DOS. See comp.os.msdos.* and MSDOS partitioning summary. The type 01 is for partitions smaller than 16 MB.
Xenix is an old port of Unix V7. Microsoft Xenix OS was announced August 1980, a portable and commercial version of the Unix operating system for the Intel 8086, Zilog Z8000, Motorola M68000 and Digital Equipment PDP-11. Microsoft introduces XENIX 3.0 in April 1983. ( Timeline of Microcomputers) SCO delivered its first Xenix for 8088/8086 in 1983. See comp.unix.xenix.sco.
Matthias Paul writes: Some old DOS versions have had a bug which requires this partition to be located in the 1st physical 32 MB of the hard disk, hence for compatibility with these old issues, partitions located elsewhere should better be assigned the ID FAT16B (06h).
Supports at most 8.4 GB disks: with type 05 DOS/Windows will not use the extended BIOS call, even if it is available. See type 0f below. Using type 05 for extended partitions beyond 8 GB may lead to data corruption with MSDOS.
An extended partition is a box containing a linked list of logical partitions. This chain (linked list) can have arbitrary length, but some FDISK versions refuse to make more logical partitions than there are drive letters available (e.g. MS-DOS LASTDRIVE=26 is good for at most 24 disk partitions; Novell DOS 7+ allows LASTDRIVE=32).
Partitions, or at least the FAT16 filesystems created on them, are at most 2 GB for DOS and Windows 95/98 (at most 65536 clusters, each at most 32 KB). Windows NT can create up to 4 GB FAT16 filesystems (using 64 KB clusters), but these cause problems for DOS and Windows 95/98. Note that VFAT is 16-bit FAT with long filenames; FAT32 is a different filesystem.
IFS = Installable File System. The best known example is HPFS.
OS/2 will only look at partitions with ID 7 for any installed
IFS (that's why the EXT2.IFS packet includes a special "Linux
partition filter" device driver to fool OS/2 into thinking Linux
partitions have ID 07). (Kai Henningsen (
Filesystem introduced in Windows NT 3.1. It is rumoured that the Windows NT boot partition must be primary, and within the first 2 GB of the disk.
Extended FAT, a.k.a. FAT64. Available in Microsoft Windows since CE 6.0 and Vista SP1. Allows 32 MB clusters and very large disks and files.
Matthias Paul writes: "This indicates a Commodore MS-DOS 3.x logically sectored FAT partition."
(according to QNX Partitions)
Some reports interchange AIX boot & data. AIX is IBM's version of Unix. See comp.unix.aix.
Coherent was a UNIX-type OS for the 286-386-486, marketed by Mark Williams Company led by Bob Swartz, renowned for its good documentation. It was introduced in 1980 and died 1 Feb 1995. The last versions are V3.2 for 286-386-486 and V4.0 (May 1992, using protected mode) for 386-486 only. It sold for $99 a copy, and the FAQ says that 40000 copies have been sold. See comp.os.coherent and this page. A Coherent partition has to be primary.
(according to QNX Partitions)
OS/2 is the operating system designed by Microsoft and IBM to be the successor of MS-DOS. Dropped by Microsoft. See comp.os.os2. Windows 2000 actively tries to destroy OS/2 Boot Manager. See below.
Open Parallel Unisys Server. See Unisys.
Partitions up to 2047GB. See Partition Types
Extended-INT13 equivalent of 0b.
Windows 95 uses 0e and 0f as the extended-INT13 equivalents of 06 and 05. For the problems this causes, see Possible data loss with LBA and INT13 extensions. (Especially when going back and forth between MSDOS and Windows 95, strange things may happen with a type 0e or 0f partition.) Windows NT does not recognize the four W95 types 0b, 0c, 0e, 0f ( Win95 Partition Types Not Recognized by Windows NT). DRDOS 7.03 does not support this type (but DRDOS 7.04 does).
Maybe decimal, for type 0a.
When it boots a DOS partition, OS/2 Boot Manager will hide all primary DOS partitions except the one that is booted, by changing its ID: 01, 04, 06 becomes 11, 14, 16. Also 07 becomes 17.
(According to Matthias Paul.)
ID 12 (decimal 18) is used by Compaq for their configuration utility partition. It is a FAT-compatible partition (about 6 MB) that boots into their utilities, and can be added to a LILO menu as if it were MS-DOS. (David C. Niemi) Stephen Collins reports a 12 MB partition with ID 12 on a Compaq 7330T. Tigran A. Aivazian reports a 40 MB partition with ID 12 on a 64 MB Compaq Proliant 1600. ID 12 is used by the Compaq Contura to denote its hibernation partition. (firstname.lastname@example.org)
NCR has used ID 0x12 MS-DOS partitions for diagnostics and firmware support on their WorldMark systems since the mid-90s. DataLight's ROM-DOS has replaced MS-DOS on more recent systems. Partition sizes were once 72M (MS-DOS) but are now 40M (ROM-DOS).
Intel has begun offering ROM-DOS based "Service Partition" support on many OEM systems. This support initially used ID 0x98 but has recently changed to ID 0x12. Intel provides their own support for this partition in the form of a System Resource CD. Partition size has remained constant at 40M. See e.g. sds2.pdf. (Chuck Rouillard)
IBM also uses 0x12 for its Rescue and Recovery partition on Thinkpad laptops. See also thinkwiki.org.
(Ralf Brown's interrupt list adds: `ID 14 resulted from using Novell DOS 7.0 FDISK to delete Linux Native partition')
AST MS-DOS 3.x was an OEM version supporting 8 instead of the usual 4 partition entries in the MBR. These special MBRs can be detected by another signature in the MBR stored in front of the partition table.
Ascentia laptops have a `Zero Volt Suspend Partition' or `SmartSleep Partition' of size 2MB+memory size. See AST. Ralf Brown calls this the "AST Windows swapfile".
Claimed for Willowtech Photon coS (completely optimized system)
by Willow Schlanger
email@example.com. See dejanews.
Sometimes a hidden IBM rescue partition.
Rumoured to be used by Willowsoft Overture File System (OFS1), if there is such a thing.
(according to delorie). And Powerquest writes `Officially listed as reserved (HP Volume Expansion, SpeedStor variant)'. See also ID a1.)
Claimed for FSo2 (Oxygen File System) by Dave Poirier
Claimed for Oxygen Extended Partition Table by
This is NEC MS-DOS 3.30 logically sectored FAT. Similar to type 14 above, the MBR could have up to 8 partition entries.
Acer laptop hidden rescue partition. Can be FAT32 or NTFS. Press Alt-F10 during boot to start this. Also other manufacturers use this type for their rescue partition.
On MBR disks, type 0x27. On GPT disks, GUID: DE94BBA4-06D1-4D40-A16A-BFD50179D6AC. A hidden version of a Windows RE type 0x7 partition with NTFS. When this is installed, reboot and press F8 in order to boot into this Recovery Environment.
MirOS BSD is a BSD variant.
See RB500_Linux_SDK. RouterBOOT loads the contents of first partition with type 39 (0x27). If there is no such partition, it displays the message "CF BOOT FAILURE: kernel partition missing!". There is no filesystem on this partition, it contains a raw ELF Linux kernel image.
AtheOS is an open source operating system written by Kurt Skauen. It is dead now - for a single page, see www.atheos.cx or sourceforge. For the history, see wikipedia. When progress seemed to stop, the project forked and the Syllable OS was started by Kristian van der Vliet (2002). See also wikipedia. It uses the same filesystem, AthFS or AFS, an extension of BeFS, the filesystem of BeOS. There is an attempt at a Linux driver at sourceforge.
A variation on AthFS is Sylstor, with added security.
Simon Butcher (
This type is being used by an operating system being developed
by Alien Internet Services in Melbourne Australia called NOS.
The id '32' was chosen not only because it's one of the few
that are left available, but 32k is the size of the
EEPROM the OS was originally targetted for.
David van Enckevort (
Type 0x35 is used by OS/2 Warp Server for e-Business,
OS/2 Convenience Pack (aka version 4.5) and
(eCS, an OEM version of OS/2 Convenience Pack) for the OS/2 implementation
of JFS (IBM AIX Journaling Filesystem).
Since JFS is a non-bootable file system, you cannot install eCS
to a JFS partition.
Plan 9 is an operating system developed at Bell Labs for many architectures. Source is available. See comp.os.plan9. Originally Plan 9 used an unallocated portion at the end of the disk. Plan 9 3rd edition uses partitions of type 0x39, subdivided into subpartitions described in the Plan 9 partition table in the second sector of the partition.
THEOS is a multiuser multitasking OS for PCs founded by Timothy Williams in 1983. Current release 4.0, previous release 3.2. They say about themselves: `THEOS with over 150,000 customers and over 1,000,000 users around the world brings a mainframe look and feel to computers without the complexity and high maintenance costs. Hundreds of applications exist with networking and Windows integration.' See the Theos home page
Cody Batt (
Drive Image makes changes to the disk,
it first changes the type flag to 0x3C so that the OS won't try to
modify it etc. At the end of the process, it gets changed back to
what it was at first. So, the only time you should see a 0x3C type flag
is if the process was interrupted somehow (power outage, user reboot etc).
If you change it back manually with a partition table editor or something
then most of the time everything is okay.
According to Powerquest.
A very old Unix-like operating system for PCs.
Ross Stell writes: The PICK multi-user operating system, developed in 1965 by Don Nelson and Dick Pick to run on an IBM 360 mainframe and implemented during the 1970s by many licensee companies on their minicomputers, was ported in 1983 by PICK Systems (http://www.marcomguy.com/pdf/CORP.PDF) to operate on the IBM PC-XT and later the AT and compatible PCs. This release is known as R83. Later (1989), PICK Systems produced Advanced PICK (AP) which operates within a Windows environment, thus obviating the need for a dedicated hard disk partition. See also Wikipedia.
Very old FAQs recommended to use 41 etc instead of 81 etc
on a disk shared with DRDOS because DRDOS allegedly disregards
the high order bit of the partition type. (Or, rather, uses the
high order bit to indicate that the partition is secured.)
These types are not used anymore today.
Roger Wolff (
I remember installing DRDOS, and getting a few extra drive letters
that I didn't expect. Turns out those are my Minix partitions.
It is looking at them as a FAT filesystem. Looks like a big mess.
After finding no other possibility than to just "not touch those drive
letters" I continue with the install. After a few minutes DRDOS
automatically decides to write a copy of the FAT into a file on one
of my MINIX partitions. Bye bye Minix partition.
SFS is an encrypted filesystem driver for DOS on 386+ PCs, written by Peter Gutmann.
If a partition table entry of type 0x42 is present in the legacy partition table, then W2K ignores the legacy partition table and uses a proprietary partition table and a proprietary partitioning scheme (LDM or DDM). As the Microsoft KnowledgeBase writes: Pure dynamic disks (those not containing any hard-linked partitions) have only a single partition table entry (type 42) to define the entire disk. Dynamic disks store their volume configuration in a database located in a 1-MB private region at the end of each dynamic disk.
GoBack is a utility that records changes made to the disk, allowing you to view or go back to some earlier state. It takes over disk I/O like a Disk Manager would, and stores its logs in its own partition.
Ulrich Straub (
The boot manager can be installed to MBR, a separate primary partition or
diskette. When installed to a primary partition this partition gets
the ID 45h. This partition does not contain a file system, it contains
only the boot manager and occupies a single cylinder (below 8 GB).
According to Powerquest. See also ID 5c.
Eumel, and later Ergos L3, are multiuser multitasking systems developed by Jochen Liedtke at GMD. It was used at German schools for the computer science education. ( Elan was the programming language used.)
According to Powerquest.
Nick Roberts at some point in time announced that he would use 4a for Aquila, but now plans to use the AODPS 7f.
See http://www-old.oberon.ethz.ch/betadocu.html and http://www.ocp.inf.ethz.ch/wiki/Documentation/Front. This partition type (decimal 76) is used for the Aos (now A2) filesystem. Type 4f is used for the Nat filesystem. One may have several partitions of this type.
QNX is a POSIX-certified, microkernel, distributed, fault-tolerant OS for the 386 and up, including support for the 386EX in embedded applications. For info see http://www.qnx.com/ or ftp.qnx.com. See also comp.os.qnx. ID 7 is outdated - QNX2 used 07, QNX4.x uses decimal 77, and optionally 78 and 79 for additional QNX partitions on a single drive. See also b1-b3 (decimal 177-179). See QNX Partitions and Neutrino filesystems.
See http://www-old.oberon.ethz.ch/native/. (The partition ID is given in this posting in comp.lang.oberon. The install instructions say that at most one partition can have this type (decimal 79), and that one needs a different type, like 50 (decimal 80) for a second Oberon system. Moreover, that users of System Commander must avoid types containing the 0x10 bit.) See also type 4c (decimal 76) above.
Disk Manager is a program of OnTrack, to enable people to use IDE disks that are larger than 504MB under DOS. For info see http://www.ontrack.com. Linux kernel versions older than 1.3.14 do not coexist with DM.
"Beginning with version 3.0, LynxOS gives users the ability to place up to 14 partitions of 2 GB each on both SCSI and IDE drives, for a total of up to 28 GB of file system space." See www.lynuxworks.com.
EZ-Drive is another disk manager (by MicroHouse, 1992). Linux kernel versions older than 1.3.29 do not coexist with EZD. (On 990323 MicroHouse International was acquired by EarthWeb; MicroHouse Solutions split off and changed its name into StorageSoft. MicroHouse Development split off and changed its name into ImageCast. It is StorageSoft that now markets EZDrive and DrivePro.)
This is a Non-Standard DOS Volume. (Disk Manager type utility software)
Doug Anderson (
DougA@ImageCast.com), with his brother Steve cofounder
of MicroHouse (1989), writes: We actually use three different partition types:
$55: `StorageSoft EZ-BIOS' - EZ-Drive, Maxtor, MaxBlast, and DriveGuide install
this type if the drive needs to be handled by our INT13 redirector.
$56: `StorageSoft EZ-BIOS DM Conversion' - Same as $55 but used
when a DiskManager "skewed" partition has been converted to EZ-BIOS.
$57: `StorageSoft DrivePro' - Used by our DrivePro product.
disk.c in the Netware source.
Not in actual use.)
Priam EDisk Partitioned Volume. This is a Non-Standard DOS Volume. (Disk Manager type utility software)
Storage Dimensions SpeedStor Volume. This is a Non-Standard DOS Volume. (Disk Manager type utility software)
A Unixware 7.1 partition must start below the 4GB limit. (If the /stand/stage3.blm is located past this limit, booting will fail with "FATAL BOOT ERROR: Can't load stage3".)
Used by PC-ARMOUR, a disk protection by Dr. A.Solomon,
intended to keep the disk inaccessible until the right
password was given (and then an int13 hook was loaded
above top-of-memory that showed c/h/s 0/0/2, with a copy
of the real partition table, when 0/0/1 was requested).
(Novell Netware used to be the main Network Operating System available.
Netware 68 or S-Net (1983) was for a Motorola 68000,
Netware 86 for an Intel 8086 or 8088.
Netware 286 was for an Intel 80286 and existed in various
versions that were later merged to Netware 2.2.
Netware 386 was a rewrite in C for the Intel 386,
later renamed 3.x - it existed at least in versions
3.0, 3.1, 3.10, 3.11, 3.12. Its successor Netware 4.xx had
versions 4.00, 4.01, 4.02, 4.10, 4.11. Then came Intranetware.)
Netware >= 3.0 uses one partition per drive. It allocates
logical Volumes inside these partitions. The volumes can be
split over several drives. The filesystem used is called
"Turbo FAT"; it only very vaguely resembles the DOS FAT file system.
(Kai Henningsen (
disk.c in the Netware source.
SMS: Storage Management Services. No longer used.
Roman Gruber reports: this code has frozen my version of norton disk-editor (so I think it has to be something special). Jeff Merkey says: 67 is for Wolf Mountain.
disk.c in the Netware source.
NSS = Novell Storage Services.
Robert Nordier writes: V7/x86, a port of UNIX Version 7 to the PC, is available at www.nordier.com/v7x86.
is freeware and shareware disk encryption software.
It supports container files, dedicated partitions (type 0x74) and
disks hidden in WAV audio files.
(Shaun Hollingworth (
Jeff Merkey writes: 77 is one we are using internally for M2FS/M2CS partitions.
disk.c in the Netware source. Not in actual use.)
XOSL Bootloader filesystem, see xosl2.com.
Claimed for F.I.X. by
firstname.lastname@example.org. See dejanews.
Proposed for the Alt-OS-Development Partition Standard.
Minix is a Unix-like operating system written by Andy Tanenbaum and students at the Vrije Universiteit, Amsterdam, around 1989-1991. It runs on PCs (8086 and up), MacIntosh, Atari, Amiga, Sparc. Ref: Operating Systems: Design and Implementation, Andrew S. Tanenbaum, Prentice-Hall, ISBN 0-13-637406-9 Since 950601 Minix is freely available - site: ftp.cs.vu.nl. See also comp.os.minix.
Solaris creates a single partition with id 0x82, then uses Sun disk labels
within the partition to split it further.
(Brandon S. Allbery (
Starting from 2005, newly installed systems will use 0xbf.
Linux is a Unix-like operating system written by Linus Torvalds and many others on the internet since Fall 1991. It runs on PCs (386 and up) and a variety of other hardware. It is distributed under GPL. Software can be found numerous places, like ftp.funet.fi, metalab.unc.edu and tsx-11.mit.edu. See also comp.os.linux.* and http://www.linux.org/. Various filesystem types like xiafs, ext2, ext3, reiserfs, etc. all use ID 83. Some systems mistakenly assume that 83 must mean ext2.
OS/2-renumbered type 04 partition.
(following Appendix E of the Microsoft APM 1.1f specification). Reported for various laptop models. E.g., used on Dell Latitudes (with Dell BIOS) that use the MKS2D utility. APM 1.2 hibernation partitions can be used by Windows 98 or higher.
Legacy Fault Tolerant FAT16 volume. Windows NT 4.0 or earlier will add 0x80 to the partition type for partitions that are part of a Fault Tolerant set (mirrored or in a RAID-5 volume). Thus, one gets types 86, 87, 8b, 8c. See also Windows NT Boot Process and Hard Disk Constraints.
Legacy Fault Tolerant NTFS volume. HPFS Fault-Tolerant mirrored partition.
Martin Kiewitz (
I'm currently writing a pretty nice boot-loader.
For this I'm using Linux Boot Loader ID A0h, and partitition
type 8Ah for the partition holding the kernel image.
Free FDISK is the FDISK used by FreeDOS. It hides types 01, 04, 05, 06, 0b, 0c, 0e, 0f by adding decimal 140 (0x8c).
See pvcreate(8) as found under http://linux.msede.com/lvm. (For a while this was 0xfe.)
Amoeba is a distributed operating system written by Andy Tanenbaum, together with Frans Kaashoek, Sape Mullender, Robert van Renesse and others since 1981. It runs on PCs (386 and up), Sun3, Sparc, 68030. It is free for universities for research/teaching purposes. For information, see ftp.cs.vu.nl.
See www.datalight.com, and type 12 above.
No, it's not a hibernation partition; it's closest to a DOS extended
partition. It's used by the Mylex DCE376 EISA SCSI adaptor for partitions
which are beyond the 1024th cylinder of a drive. I've only seen references
to type 99 with the DCE376.
ForthOS is the name Andy Valencia uses for his Forth operating system, a port of eForth. Also the older VSTA by the same author uses partition type 0x9e (158).
Current sysid for BSDI. The types b7 and b8 given below are for an older version of the filesystem used in pre-v3.0 versions of the OS. These days the system is v4.1 BSD/OS. BSDI reports 2.1 million installed servers and 12 million licenses sold. See http://www.bsdi.com/.
Reported for various laptops like IBM Thinkpad, Phoenix NoteBIOS, Toshiba under names like zero-volt suspend partition, suspend-to-disk partition, save-to-disk partition, power-management partition, hibernation partition. Usually at the start or end of the disk area. (This is also the number used by Sony on the VAIO. Recent VAIOs can also hibernate to a file in the filesystem, the choice being made from the BIOS setup screen.)
Reportedly used as "Save-to-Disk" partition on a NEC 6000H notebook. Types a0 and a1 are used on systems with Phoenix BIOS; the Phoenix PHDISK utility is used with these.
IDs 21, a1, a3, a4, a6, b1, b3, b4, b6 are for HP Volume Expansion (SpeedStor variant).
386BSD is a Unix-like operating system, a port of 4.3BSD Net/2 to the PC done by Bill Jolitz around 1991. When Jolitz seemed to stop development, an updated version was called FreeBSD (1992). The outcome of a Novell vs. UCB law suit was that Net/2 contained AT&T code, and hence was not free, but that 4.4BSD-Lite was free. After that, FreeBSD and NetBSD were restructured, and FreeBSD 2.0 and NetBSD 1.0 are based on 4.4BSD-Lite. FreeBSD runs on PCs. See http://www.freebsd.org/FreeBSD.html. For NetBSD, see below - it changed partition type to a9. 386BSD seems to be dead now. The kernel source is being published - see Operating System Source Code Secrets by Bill and Lynne Jolitz. See comp.os.386bsd.*. See http://www.paranoia.com/~vax/boot.html for NetBSD boot and partitioning info.
OpenBSD, led by Theo de Raadt, split off from NetBSD. It tries to emphasize on security. See http://www.openbsd.org/.
Based on Mach 2.6 and features of Mach 3.0, is a true object-oriented operating system and user environment. See http://www.next.com/.
Apple's OS-X ( Darwin Intel) uses this type for its filesystem partition (a UFS file system, in NeXT flavour, only differing from the *BSD formats in the first 8 KB). See also type ab.
NetBSD is one of the children of *BSD (see above). It runs on PCs and a variety of other hardware. Since 19-Feb-98 NetBSD uses a9 instead of a5. See http://www.netbsd.org/. It is freely obtainable - see http://www.netbsd.org/Sites/net.html.
Contains a bare DOS 6.22 and a utility to exchange types
06 and aa in the partition table. (
Apple's OS-X (Darwin Intel) uses this type for its boot partition.
The image (
/usr/standalone/i386/boot) starts at sector 1.
See also type a8.
Unused. Claimed by Stanislav Karchebny for his GO! OS.
Unused. Claimed by Ben Avison for RISC OS, originally from Acorn. The filesystem is in the FileCore format.
Unused. Claimed by Frank Barrus for his ShagOS.
Used by Apple for the MacOS X filesystem HFS or HFS+ on Intel.
The boot manager BootStar manages its own partition table, with up to 15 primary partitions. It fills unused entries in the MBR with BootStar Dummy values. See www.star-tools.com. If you use this, don't use a disk manager, do not put LILO in the MBR and do not use fdisk.
Steve Reid (
We've recently added a new Power-Safe filesystem to the QNX Neutrino
RTOS, and it uses decimal 177, 178, and 179 (B1, B2, and B3) for its
Default is 179.
BSDI (Berkeley Software Design, Inc.) was founded by former CSRG (UCB Computer Systems Research Group) members. Their operating system, based on Net/2, was called BSD/386. After the USL (Unix System Laboratories, Inc./Novell Corp.) vs. BSDI lawsuit, new releases were based on BSD4.4-Lite. Now they are announcing BSD/OS V2.0.1. This is an operating for PCs (386 and up), boasting 3000 customers. (That was long ago. The current partition id is 9f, see above.)
(PTS) BootWizard 4.0 and its new version Acronis OS Selector 5.0 use this id (i) when hiding partitions with types other than 01, 04, 06, 07, 0b, 0c, 0e, and (ii) when creating a partition without file system. See www.PhysTechSoft.com. The boot software was purchased on 2001-01-05 by SWsoft. See www.acronis.com.
Recognized as Acronis Secure Zone, when labelled "ACRONIS SZ". A primary partition, formatted with FAT32, LBA mapped.
The old 0x82 id conflicted with Linux swap. New Solaris installations
will use the id 0xbf. (Larry Lee
See d0 below.
disk.c in the Netware source.
DR-DOS 7.02+ / OpenDOS 7.01 / Novell DOS 7 secured partition.
According to Powerquest IDs c2, c3, c8, c9, ca, cd are reserved for DR-DOS 7+. According to Matthias Paul c2, c3, cd are no longer reserved for DR-DOS.
Benedict Chong (
BlueSky Innovations LLC does a boot manager product
called Power Boot and we use, in addition,
0C2h and 0C3h for hidden Linux partitions (swap and ext2fs).
See also ID c2.
This ID may also be used in obscure trickery: on a shared MS-DOS / DR-DOS machine with DR-DOS 6.0-7.03 (so that the DR_DOS does not understand type 0f and the MS-DOS does not understand type c5) one may have two extended partitions, where each operating system sees only one.
DR-DOS 6.0 and higher (NetWare PalmDOS 1.0, Novell DOS 7, OpenDOS 7.01, DR-DOS 7.02+) will add 0xc0 to the partition type for a LOGIN.EXE-secured partition (so that people cannot avoid the password check by booting from an MS-DOS floppy). Otherwise it seems that the types c1, c4, c5, c6 and d1, d4, d5, d6 are used precisely like 01, 04, 05, 06 (but are accepted only when booting from disk).
NTFS will add 0xc0 to the partition type for disabled parts of a Fault Tolerant set. Thus, one gets types c6, c7. See also Windows NT Boot Process and Hard Disk Constraints and Switching from DR-DOS 6.0 to MS-DOS 5.0.
Primary partition only.
REAL/32 is a continuation of DR Multiuser DOS.
It supports FAT12, FAT16 and REAL/32 7.90 also supports FAT32.
Andrew Freeman (
For partitions which have been marked as secure we use
0xC0 and 0xD0 as partition markers (C0 < 32mb, D0 >= 32mb).
REAL/32 is an advanced 32-bit multitasking & multi-user
MS-DOS & Windows compatible operating system.
Home page is
This applies to the whole MDOS family range, Digital Research DR Multiuser DOS and Novell DR Multiuser DOS, as well as to Concurrent Controls Multiuser DOS, Datapaq Australasia System Manager 7, and IMS Multiuser DOS.
Added on request of John Hardin (
Powercopy Backup (shielded disk), used by www.datapower.de.
Mark Morgan Lloyd (
uses type 0xdb to store a protected-mode binary image of the code
to be run on a 'x86-based SCPU (Supervisory CPU) module from the DT800 range.
Glenn Steen (
When I made an old Aviion 2000 triple-boot (DOS, DG/UX and Linux)
I saw that Linux fdisk reported the DG/UX virtual disk manager
partition as type 0xdf.
The boot manager BootIt manages its own partition table, with up to 255 primary partitions. See www.terabyteunlimited.com. If you use this, don't use a disk manager, do not put LILO in the MBR and do not use fdisk. Reference for the ID: BOOTIT.TXT.
Kevin Cummings reports in alt.os.linux: it's a SSTOR partition on cylinders > 1023.
LUKS (Linux Unified Key Setup) partition.
BeOS is an operating system that runs on Power PCs and on Intel PCs. Version 5 (the last version) is distributed freely to individuals. The system was sold to Palm and is not developed any more. OpenBeOS tries to create an open source version.
SkyOS is an operating system written by Robert Szeleney. Its filesystem SkyFS is based on OpenBeFS.
Matthias Paul plans to use this for an OS called Sprytix.
Bob Griswold (
MS plans on using EE and EF in the future for support of
non-legacy BIOS booting.
Mark Doran (
email@example.com) adds: these types are used to
support the Extensible Firmware Interface specification (EFI); go to
and search for EFI.
(For the types ee and ef, see Tables 16-6 and 16-7 of
the EFI specification, EFISpec_091.pdf.)
Paul Bame (
firstname.lastname@example.org) writes: the F0 partition will be
located in the first 2GB of a drive and used to store the
boot loader and boot command line, optionally including a kernel and ramdisk.
Matthias Paul writes: "This ID was originally used by Sperry IT MS-DOS 3.xx for a logically sectored variant of FAT. When Sperry IT became part of Unisys, the operating system was called Unisys MS-DOS 3.3. Digital Research's DOS Plus 2.1 (for OEM machines such as the Amstrad/Schneider PC1512, the T.R.A.N. Jasmin Turbo (Speed 8M), or the Acorn BBC Master 512 also supports this ID and logs it in, as if this would be either a type 01h FAT12 or a type 04h FAT16 partition."
Powerquest writes: Storage Dimensions SpeedStor.
The type F4 partition contains one volume, and is not used anymore. The type F5 partition contains 1 to 10 volumes (called MD0 to MD9). It supports one or more systems (Prologue 3, 4, 5, Twin Server). Each volume can have as file system the NGF file system or TwinFS file system. NGF (old): volume size at most 512 MB, at most 895 files per directory, at most 256 directories per volume. TwinFS (new): volume size up to 4 GB. No limit in number of files and directories. See Prologue.
Christopher George writes: "0xF7 is the partition ID for an internally developed Solid State File System (SSFS) created to maximize IOPS performance by utilizing unique capabilities of solid state storage, e.g. the DDRdrive X1." See www.ddrdrive.com.
Maybe Natalia Portillo plans to use this for O.S.G. EFAT ("Enhanced File Allocation Techniques").
Ed Sawicki writes: "We propose using the F9 partition type as a pCache partition, which is our name for an "ext2/ext3 persistent cache partition". See www.alcpress.com.
Rob Judd writes: MandrakeSoft's Bochs x86 emulator (similar to VMWare) uses fa as a partition identifier.
Also used as VMkernel dump partition. (Cf. vmwareguide.)
VMware offers virtual machines in which one can run Linux, Windows, FreeBSD.
See the HOWTO and the kernel patches. Earlier, 86 was used instead of fd.
Powerquest writes: Reserved for FreeDOS ( www.freedos.org), but it seems FreeDOS never used this ID.
Mark Morgan Lloyd (
Windows NT Disk Administrator marks hidden partitions (i.e. present but
not to be accessed) as type 0xfe. A primary partition of this type is also
used by IBM to hold an image of the "Reference Diskettes" on many of their
machines, particularly newer PS/2 systems (at a rough guess, anything built
after about 1994). This clash can cause major confusion and grief
if running NT on IBM kit.
When this Reference Partition is activated, it changes its type into 1
(FAT12) and hides all other partitions by adding 0x10 to the type.
This has been in use since the early LVM days back in 1997, and has now (Sept. 1999) been renamed 0x8e.