BIOSPARAMETERBLOCK: Difference between revisions

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.

@@ Line 1: / Line 1: @@
-== BIOSPARAMETERBLOCK ==
 BIOS Parameter Block
 === Type ===
-  [[OS2 API:DataType:USHORT|USHORT]]   usBytesPerSector;
+  [[USHORT]]   usBytesPerSector;
-  [[OS2 API:DataType:BYTE|BYTE]]     bSectorsPerCluster;
+  [[BYTE]]     bSectorsPerCluster;
-  [[OS2 API:DataType:USHORT|USHORT]]   usReservedSectors;
+  USHORT   usReservedSectors;
-  [[OS2 API:DataType:BYTE|BYTE]]     cFATs;
+  BYTE     cFATs;
-  [[OS2 API:DataType:USHORT|USHORT]]   cRootEntries;
+  USHORT   cRootEntries;
-  [[OS2 API:DataType:USHORT|USHORT]]   cSectors;
+  USHORT   cSectors;
-  [[OS2 API:DataType:BYTE|BYTE]]     bMedia;
+  BYTE     bMedia;
-  [[OS2 API:DataType:USHORT|USHORT]]   usSectorsPerFAT;
+  USHORT   usSectorsPerFAT;
-  [[OS2 API:DataType:USHORT|USHORT]]   usSectorsPerTrack;
+  USHORT   usSectorsPerTrack;
-  [[OS2 API:DataType:USHORT|USHORT]]   cHeads;
+  USHORT   cHeads;
-  [[OS2 API:DataType:ULONG|ULONG]]    cHiddenSectors;
+  [[ULONG]]    cHiddenSectors;
-  [[OS2 API:DataType:ULONG|ULONG]]    cLargeSectors;
+  ULONG    cLargeSectors;
-  [[OS2 API:DataType:BYTE|BYTE]]     abReserved[6];
+  BYTE     abReserved[6];
-  [[OS2 API:DataType:USHORT|USHORT]]   cCylinders;
+  USHORT   cCylinders;
-  [[OS2 API:DataType:BYTE|BYTE]]     bDeviceType;
+  BYTE     bDeviceType;
-  [[OS2 API:DataType:USHORT|USHORT]]   fsDeviceAttr;
+  USHORT   fsDeviceAttr;
 ==== C Declaration Method ====
@@ Line 24: / Line 23: @@
 === Fields ===
-{|class="wikitable"
+;usBytesPerSector:Number of bytes per sector
-|usBytesPerSector||Number of bytes per sector
+;bSectorsPerCluster:Number of sectors per cluster
-|-
+;usReservedSectors:Number of reserved sectors
-|bSectorsPerCluster||Number of sectors per cluster
+;cFATs:Number of FATs
-|-
+;cRootEntries:Number of root directory entries
-|usReservedSectors||Number of reserved sectors
+;cSectors:Number of sectors
-|-
+;bMedia:Media descriptor
-|cFATs||Number of FATs
+;usSectorsPerFAT:Number of secctors per FAT
-|-
+;usSectorsPerTrack:Number of sectors per track
-|cRootEntries||Number of root directory entries
+;cHeads:Number of heads
-|-
+;cHiddenSectors:Number of hidden sectors
-|cSectors||Number of sectors
+;cLargeSectors:Number of large sectors
-|-
+;abReserved[6]:Reserved
-|bMedia||Media descriptor
+;cCylinders:Number of cylinders defined for the physical device
-|-
+;bDeviceType:Physical layout of the specified device
-|usSectorsPerFAT||Number of secctors per FAT
+::0  48 TPI low-density diskette drive
-|-
+::1  96 TPI high-density diskette drive
-|usSectorsPerTrack||Number of sectors per track
+::2  Small (3.5-inch) 720KB drive
-|-
+::3  8-inch single-density diskette drive
-|cHeads||Number of heads
+::4  8-inch double-density diskette drive
-|-
+::5  Fixed disk
-|cHiddenSectors||Number of hidden sectors
+::6  Tape drive
-|-
+::7  Other (includes 1.44MB 3.5-inch diskette drive)
-|cLargeSectors||Number of large sectors
+::8  R/W optical disk
-|-
+::9  3.5-inch 4.0MB diskette drive (2.88MB formatted)
-|abReserved[6]||Reserved
+;fsDeviceAttr:A bit field that returns flag information about the specified drive
-|-
-|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
+::0  Media is removable
-:1   Media cannot be removed
+::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
+::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.
+::1  Device support determines that the media was removed since the last I/O operation.
-|}
 [[Category:Data type]]