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== BIOSPARAMETERBLOCK ==
BIOS Parameter Block
 
BIOS Parameter Block.


=== Type ===
=== Type ===
[[USHORT]]  usBytesPerSector;
[[BYTE]]    bSectorsPerCluster;
USHORT  usReservedSectors;
BYTE    cFATs;
USHORT  cRootEntries;
USHORT  cSectors;
BYTE    bMedia;
USHORT  usSectorsPerFAT;
USHORT  usSectorsPerTrack;
USHORT  cHeads;
[[ULONG]]    cHiddenSectors;
ULONG    cLargeSectors;
BYTE    abReserved[6];
USHORT  cCylinders;
BYTE    bDeviceType;
USHORT  fsDeviceAttr;


typedef struct _BIOSPARAMETERBLOCK {
==== C Declaration Method ====
[[OS2 API:DataType:USHORT|USHORT]]  usBytesPerSector;
typedef struct
[[OS2 API:DataType:BYTE|BYTE]]    bSectorsPerCluster;
[[OS2 API:DataType:USHORT|USHORT]]  usReservedSectors;
[[OS2 API:DataType:BYTE|BYTE]]    cFATs;
[[OS2 API:DataType:USHORT|USHORT]]  cRootEntries;
[[OS2 API:DataType:USHORT|USHORT]]  cSectors;
[[OS2 API:DataType:BYTE|BYTE]]    bMedia;
[[OS2 API:DataType:USHORT|USHORT]]  usSectorsPerFAT;
[[OS2 API:DataType:USHORT|USHORT]]  usSectorsPerTrack;
[[OS2 API:DataType:USHORT|USHORT]]  cHeads;
[[OS2 API:DataType:ULONG|ULONG]]    cHiddenSectors;
[[OS2 API:DataType:ULONG|ULONG]]    cLargeSectors;
[[OS2 API:DataType:BYTE|BYTE]]    abReserved[6];
[[OS2 API:DataType:USHORT|USHORT]]  cCylinders;
[[OS2 API:DataType:BYTE|BYTE]]    bDeviceType;
[[OS2 API:DataType:USHORT|USHORT]]  fsDeviceAttr;
} BIOSPARAMETERBLOCK;
   
   
=== Fields ===
=== Fields ===
;usBytesPerSector:Number of bytes per sector
;bSectorsPerCluster:Number of sectors per cluster
;usReservedSectors:Number of reserved sectors
;cFATs:Number of FATs
;cRootEntries:Number of root directory entries
;cSectors:Number of sectors
;bMedia:Media descriptor
;usSectorsPerFAT:Number of secctors per FAT
;usSectorsPerTrack:Number of sectors per track
;cHeads:Number of heads
;cHiddenSectors:Number of hidden sectors
;cLargeSectors:Number of large sectors
;abReserved[6]:Reserved
;cCylinders:Number of cylinders defined for the physical device
;bDeviceType:Physical layout of the specified device
::0  48 TPI low-density diskette drive
::1  96 TPI high-density diskette drive
::2  Small (3.5-inch) 720KB drive
::3  8-inch single-density diskette drive
::4  8-inch double-density diskette drive
::5  Fixed disk
::6  Tape drive
::7  Other (includes 1.44MB 3.5-inch diskette drive)
::8  R/W optical disk
::9  3.5-inch 4.0MB diskette drive (2.88MB formatted)
;fsDeviceAttr:A bit field that returns flag information about the specified drive
:Bit 0  Removable Media flag
::0  Media is removable
::1  Media cannot be removed
:Bit 1  Changeline flag
::0  The physical device driver returns the value 0, Unsure if media has changed, from the Media Check function
::1  Device support determines that the media was removed since the last I/O operation.


usBytesPerSector  Number of bytes per sector.
[[Category:Data type]]
bSectorsPerCluster Number of sectors per cluster.
usReservedSectors  Number of reserved sectors.
cFATs              Number of FATs.
cRootEntries      Number of root directory entries.
cSectors          Number of sectors.
bMedia            Media descriptor.
usSectorsPerFAT    Number of secctors per FAT.
usSectorsPerTrack  Number of sectors per track.
cHeads            Number of heads.
cHiddenSectors    Number of hidden sectors.
cLargeSectors      Number of large sectors.
abReserved[6]     Reserved.
cCylinders        Number of cylinders defined for the physical device.
bDeviceType        Physical layout of the specified device.
 
                    0  48 TPI low-density diskette drive
                    1  96 TPI high-density diskette drive
                    2  Small (3.5-inch) 720KB drive
                    3  8-inch single-density diskette drive
                    4  8-inch double-density diskette drive
                    5  Fixed disk
                    6  Tape drive
                    7  Other (includes 1.44MB 3.5-inch diskette drive)
                    8  R/W optical disk
                    9  3.5-inch 4.0MB diskette drive (2.88MB formatted)
 
fsDeviceAttr      A bit field that returns flag information about the
                    specified drive.
 
                    Bit 0  Removable Media flag.
 
                    0  Media is removable.
                    1  Media cannot be removed.
 
                    Bit 1  Changeline flag.
 
                    0  The physical device driver returns the value 0, Unsure
                        if media has changed, from the Media Check function.
                    1  Device support determines that the media was removed
                        since the last I/O operation.

Latest revision as of 13:51, 24 May 2017

BIOS Parameter Block

Type

USHORT   usBytesPerSector;
BYTE     bSectorsPerCluster;
USHORT   usReservedSectors;
BYTE     cFATs;
USHORT   cRootEntries;
USHORT   cSectors;
BYTE     bMedia;
USHORT   usSectorsPerFAT;
USHORT   usSectorsPerTrack;
USHORT   cHeads;
ULONG    cHiddenSectors;
ULONG    cLargeSectors;
BYTE     abReserved[6];
USHORT   cCylinders;
BYTE     bDeviceType;
USHORT   fsDeviceAttr;

C Declaration Method

typedef struct

Fields

usBytesPerSector
Number of bytes per sector
bSectorsPerCluster
Number of sectors per cluster
usReservedSectors
Number of reserved sectors
cFATs
Number of FATs
cRootEntries
Number of root directory entries
cSectors
Number of sectors
bMedia
Media descriptor
usSectorsPerFAT
Number of secctors per FAT
usSectorsPerTrack
Number of sectors per track
cHeads
Number of heads
cHiddenSectors
Number of hidden sectors
cLargeSectors
Number of large sectors
abReserved[6]
Reserved
cCylinders
Number of cylinders defined for the physical device
bDeviceType
Physical layout of the specified device
0 48 TPI low-density diskette drive
1 96 TPI high-density diskette drive
2 Small (3.5-inch) 720KB drive
3 8-inch single-density diskette drive
4 8-inch double-density diskette drive
5 Fixed disk
6 Tape drive
7 Other (includes 1.44MB 3.5-inch diskette drive)
8 R/W optical disk
9 3.5-inch 4.0MB diskette drive (2.88MB formatted)
fsDeviceAttr
A bit field that returns flag information about the specified drive
Bit 0 Removable Media flag
0 Media is removable
1 Media cannot be removed
Bit 1 Changeline flag
0 The physical device driver returns the value 0, Unsure if media has changed, from the Media Check function
1 Device support determines that the media was removed since the last I/O operation.
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