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| en:docs:dos:api:int25 [2024/05/19 09:20] – prokushev | en:docs:dos:api:int25 [2024/05/19 10:11] – prokushev | ||
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| ===== Brief ===== | ===== Brief ===== | ||
| - | ABSOLUTE DISK READ (except partitions > 32M) | + | Absolute disk read |
| ===== Family API ===== | ===== Family API ===== | ||
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| * AL = drive number (00h = A:, 01h = B:, etc) | * AL = drive number (00h = A:, 01h = B:, etc) | ||
| * CX = number of sectors to read (not FFFFh) | * CX = number of sectors to read (not FFFFh) | ||
| - | | + | |
| - | * DS:BX -> buffer for data | + | * DS:BX -> buffer for data |
| + | * CX = FFFFh (DOS 3.31+) | ||
| + | * DS:BX -> disk read packet (see #02548) | ||
| ===== Return ===== | ===== Return ===== | ||
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| ===== Macro ===== | ===== Macro ===== | ||
| - | |||
| ===== Notes ===== | ===== Notes ===== | ||
| - | AX = 0207h if more than 64K sectors on drive -- use new-style call | + | partition is potentially >32M (and requires this form of the call) if bit 1 of the device attribute word in the device driver is set |
| + | |||
| + | for FAT32 drives (which may be up to 2TB in size), use INT 21/ | ||
| + | |||
| + | AX = 0207h if more than 64K sectors on drive or if FAT32 drive -- use CX=FFFFH or INT 21/AX=7305h | ||
| - | may destroy all other registers except segment registers | + | may destroy all other registers except segment registers; Win9X always sets SI to 0000h due to an apparent coding bug |
| original flags are left on stack, and must be popped by caller | original flags are left on stack, and must be popped by caller | ||
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| ===== See Also ===== | ===== See Also ===== | ||
| - | INT 13/AH=02h,INT 25/ | + | INT 13/AH=02h,[[en: |
| | | ||
| ===== Note ===== | ===== Note ===== | ||