Category: <b>disk I/O enhancements</b>
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<pre><b>INT 21 - SFS v1.00 - DRIVER CONTROL</b>

	AX = 4405h
	BL = drive number (00h = default, 01h = A:, etc)
	CX = number of bytes to write
	DS:DX -&gt; data to write (see <a href=../../it/43/15.html>#01543</a>)
Return: CF clear if successful
	    AX = number of bytes actually written
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see <a href=../../it/80/16.html>#01680</a> at AH=59h/BX=0000h)
Program: SFS (Secure FileSystem) is a shareware encrypting disk driver by
	  Peter C. Gutmann
SeeAlso: AX=4404h"SFS"

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