File system Indicator Byte in Hexadecimal |
Partition/ File system Description |
19H |
Willowtech Photon COS
(Code 19H is Claimed for Willowtech Photon COS by Willow Schlanger. |
1bH |
Hidden WIN95 OSR2 32-bit FAT or Hidden Windows 95 FAT32 Partition |
1cH |
LBA-mapped Hidden WIN95 OSR2 32-bit FAT
(It is hidden Windows95 FAT32 partition using LBA-mode of INT 13H Extensions) |
1eH |
LBA-mapped Hidden WIN95 16-bit FAT or Hidden LBA VFAT partition |
1FH |
LBA mapped Hidden WIN95 Extended or Hidden Extended LBA VFAT Partition |
20H |
OFSI
(Willowsoft Overture File System ) |
21H |
Officially listed as Reserved
(HP Volume Expansion, SpeedStor variant.) |
21H |
FSO2
(Claimed for FSO2 (Oxygen File System) by Dave Poirier) |
22H |
FSO2 Extended Partition
(Claimed for Oxygen Extended Partition by Dave Poirier) |
23H |
Officially listed as Reserved |
24H |
NEC DOS 3.x |
26H |
Officially listed as Reserved |
31H |
Officially listed as Reserved |
32H |
NOS (Network Operating System)
(32H is being used by the operating system NOS, being developed by Alien Internet Services in Melbourne Australia. The id 32H was chosen not only because of it was one of the few that are left available but also 32k is the size of the EEPROM the OS was originally targeted for. |
33H |
Officially listed as Reserved |
34H |
Officially listed as Reserved |
35H |
JFS on OS/2 or eCS
[35H is used by OS/2 Warp Server for e-Business, OS/2 Convenience Pack (aka version 4.5) and eComStation (eCS, an OEM version of OS/2 Convenience Pack) for the OS/2 implementation of JFS (IBM AIX Journaling File System)] |
36H |
Officially listed as Reserved |
38H |
THEOS v3.2 (2GB partition) |
39H |
Plan 9 partition
(Plan 9 is an operating system developed at Bell Labs for many architectures. Originally Plan 9 used an unallocated portion at the end of the disk. 3rd edition of Plan 9 uses partitions of type 39H, subdivided into sub partitions described in the Plan 9 partition table in the second sector of the partition.) |
39H |
THEOS v4 spanned partition |
3aH |
THEOS v4 (4GB partition) |
3bH |
THEOS v4 Extended partition
(THEOS is a multi-user multitasking Operating System for PCs founded by Timothy Williams in 1983.) |
3cH |
PartitionMagic recovery partition
(When a PowerQuest product like Partition Magic or Drive Image makes changes to the disk, it first changes the type flag to 3CH so that the Operating System will not try to modify it. At the end of the process, it is changed back to what it was at first. Therefore the only time you can see a 3CH type flag, is if the process was interrupted somehow such as power off, user reboot etc. If you change it back manually with a partition table editor or any disk editing program then most of the time everything is okay.) |
3dH |
Hidden NetWare |
40H |
Venix 80286
(It is a very old Unix-like operating system for PCs.) |
41H |
Linux/MINIX (sharing disk with DR-DOS)
(DR-DOS stands for Digital Research-Disk Operating System.) |
41H |
Personal RISC Boot |
41H |
PPC PReP (Power PC Reference Platform) Boot Partition |
42H |
Linux swap (sharing disk with DR-DOS) |
42H |
SFS (Secure File System)
(SFS is an encrypted file System driver for DOS on 386+ PCs, written by Peter Gutmann.) |
