Windows 95 Partition Types Not Recognized by Windows NT

ID: Q151414

The information in this article applies to:

Microsoft Windows NT operating system version 3.1
Microsoft Windows NT Advanced Server version 3.1
Microsoft Windows NT Workstation versions 3.5, 3.51, 4.0
Microsoft Windows NT Server versions 3.5, 3.51, 4.0

SUMMARY

Windows NT does not recognize Windows 95 FAT32 partitions.

MORE INFORMATION

OEM versions of Windows 95 support four partition types for FAT file systems that Windows NT does not recognize. The partition type can be identified by the System ID byte in the partition table. This byte is located at the following offsets:


   0x1C2 = Partition 1
   0x1D2 = Partition 2
   0x1E2 = Partition 3
   0x1F2 = Partition 4

The four values used by Windows 95 that Windows NT does not recognize are as follows:


   0x0B      Primary  Fat32 Partitions up to 2047 GB
   0x0C      Same as 0x0B, uses Logical Block Address Int 0x13 extensions
   0x0E      Same as 0x06, uses Logical Block Address Int 0x13 extensions
   0x0F      Same as 0x05, uses Logical Block Address Int 0x13 extensions

The FAT partition types that Windows NT version 3.X and 4.0 can recognize are:


   0x01      Fat12 < 10 megabytes
   0x04      Fat16 < 32 megabytes
   0x06      Fat16 > 32 megabytes
   0x05      Extended (may be FAT, HPFS or NTFS)

Additional query words: 3.10 3.50 3.51 4.00 prodnt


Keywords          : kbenv ntfilesys NTSrvWkst 
Version           : 3.1 3.5 3.51 4.0
Platform          : winnt 
Issue type        :

Last Reviewed: February 20, 1999