FILE_SYSTEM_RECOGNITION_STRUCTURE structure
Contains the on-disk file system recognition information stored in the volume's boot sector (logical disk sector zero).
This is an internally-defined data structure not available in a public header and is provided here for file system developers who want to take advantage of file system recognition. For more information, see File System Recognition.
Syntax
typedef struct _FILE_SYSTEM_RECOGNITION_STRUCTURE {
UCHAR Jmp[3];
UCHAR FsName[8];
UCHAR MustBeZero[5];
ULONG Identifier;
USHORT Length;
USHORT Checksum;
} FILE_SYSTEM_RECOGNITION_STRUCTURE;
Members
-
Jmp
-
The JMP instruction. This data member is not included in the value contained in the Checksum data member.
-
FsName
-
The file system name. This is a sequence of 8 ASCII characters that represents the nonlocalizable human-readable name of the file system the volume is formatted with.
This string is in the same place as the OEM file system name on a disk with a normal BIOS parameter block (BPB) structure.
-
MustBeZero
-
Reserved space that contains all zeros.
This data member overlaps what normally are the following data members in a BPB:
- BytesPerSector
- SectorsPerCluster
- ReservedSectorCount
Because these data members are set to zero, this should be sufficient to cause earlier OSs to conclude that this is not a valid BPB and therefore recognize the volume.
-
Identifier
-
A structure identifier. Must contain the value 0x53525346 arranged in little-endian byte order.
At this point in the structure, the data is aligned to 16 bytes.
-
Length
-
The number of bytes in this structure, from the beginning to the end, including the Jmp data member.
-
Checksum
-
A two-byte checksum calculated over the bytes starting at the FsName data member and ending at the last byte of this structure, excluding the Jmp and Checksum data members.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 7 [desktop apps only] |
| Minimum supported server |
Windows Server 2008 R2 [desktop apps only] |