49 lines
1.2 KiB
PHP
49 lines
1.2 KiB
PHP
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; Microsoft Confidential
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; Copyright (C) Microsoft Corporation 1991
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; All Rights Reserved.
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;
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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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; C A V E A T P R O G R A M M E R ;
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; ;
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;** BIOS PARAMETER BLOCK DEFINITION
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;
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; The BPB contains information about the disk structure. It dates
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; back to the earliest FAT systems and so FAT information is
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; intermingled with physical driver information.
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;
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; A boot sector contains a BPB for its device; for other disks
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; the driver creates a BPB. DOS keeps copies of some of this
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; information in the DPB.
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;
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; The BDS structure contains a BPB within it.
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;
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A_BPB STRUC
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BPB_BYTESPERSECTOR DW ?
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BPB_SECTORSPERCLUSTER DB ?
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BPB_RESERVEDSECTORS DW ?
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BPB_NUMBEROFFATS DB ?
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BPB_ROOTENTRIES DW ?
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BPB_TOTALSECTORS DW ?
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BPB_MEDIADESCRIPTOR DB ?
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BPB_SECTORSPERFAT DW ?
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BPB_SECTORSPERTRACK DW ?
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BPB_HEADS DW ?
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BPB_HIDDENSECTORS DW ?
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DW ?
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BPB_BIGTOTALSECTORS DW ?
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DW ?
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DB 6 DUP(?) ; NOTE: many times these
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; ; 6 bytes are omitted
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; ; when BPB manipulations
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; ; are performed!
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A_BPB ENDS
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; ;
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; C A V E A T P R O G R A M M E R ;
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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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