Int 21/AX=4405h

DBLSPACE.BIN - IOCTL - FLUSH OR INVALIDATE INTERNAL CACHES

AX = 4405h
BL = drive number (00h = default, 01h = A:, etc)
CX = 000Ah (size of DSPACKET structure)
DS:DX -> DSPACKET structure (see #01537)

Return:
CF clear if IOCTL successful -- check DSPACKET for actual status
AX = number of bytes actually transferred
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

Note: This call is identical to the documented AX=4404h


Format of DoubleSpace DSPACKET structure:

Offset  Size    Description     (Table 01537)
00h    WORD    signature 444Dh ("DM")
02h    BYTE    command code
46h ('F') flush internal caches
49h ('I') flush and invalidate internal caches
03h    WORD    result code
(ret) 4F4Bh ("OK") if successful, else unchanged
05h  5 BYTEs   padding

Category: File/Disk Compression - Int 21h - D

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