243 lines
14 KiB
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243 lines
14 KiB
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<TITLE>Int 21/AX=4405h
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<META NAME="Description" CONTENT="
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Int 21/AX=4405h - SFS v1.00 - DRIVER CONTROL -
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AX = 4405h
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BL = drive number (00h = default, 01h = A:, etc)
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CX = number of bytes to write
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DS:DX - data to write (see #01543)
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Return: CF clear if successful
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AX = number of bytes actually written
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CF set on error
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AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
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Program: SFS (Secure FileSystem) is a shareware encrypting disk driver by
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Peter C. Gutmann
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<h2>Int 21/AX=4405h
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<h3><font color=#C00040>SFS v1.00 - DRIVER CONTROL</font></h3>
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<PRE>
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AX = 4405h
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BL = drive number (00h = default, 01h = A:, etc)
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CX = number of bytes to write
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DS:DX -> data to write <a href="rb-2886.htm#Table1543" tppabs="http://www.ctyme.com/intr/rb-2886.htm#Table1543">(see #01543)</a><br>
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<p><b>Return:</b><br>CF clear if successful
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AX = number of bytes actually written
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CF set on error
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AX = error code (01h,05h,06h,0Dh) <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
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</PRE>
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<p><b>Program:</b>
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SFS (Secure FileSystem) is a shareware encrypting disk driver by
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Peter C. Gutmann
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<p><b>See Also:</b>
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<a href="rb-2880.htm" tppabs="http://www.ctyme.com/intr/rb-2880.htm">AX=4404h"SFS"</a>
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<PRE>
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<p>
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<a name=table1542></a>
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(Table 01542)
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Values for SFS control function:
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00h "PACKET_SET_DISKINFO" set disk parameters
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01h "PACKET_SET_KEYINFO" set keying information
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02h "PACKET_SET_READONLY" select read/write or read-only
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03h "PACKET_SET_DRIVENO" set drive number to mount
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04h "PACKET_SET_MOUNTSTATUS" set mount status
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05h "PACKET_SET_UNMOUNT" set/clear quick-unmount hotkey
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06h "PACKET_SET_TIMEOUT" set/clear auto-unmount timeout
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<p>
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Format of SFS control data packet:
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<a name=table1543></a>
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Offset Size Description (Table 01543)
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00h WORD signature 4330h ('C0')
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02h WORD function <a href="rb-2886.htm#Table1542" tppabs="http://www.ctyme.com/intr/rb-2886.htm#Table1542">(see #01542)</a>
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---function 00h---
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04h WORD sector size in bytes
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06h BYTE sectors per cluster
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07h WORD number of boot sectors
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09h BYTE number of copies of FAT
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0Ah WORD size of root directory in entries
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0Ch WORD number of sectors on disk, 16-bit
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0Eh BYTE media descriptor byte
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0Fh WORD sectors per FAT
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11h WORD sectors per track
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13h WORD number of heads
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15h DWORD number of hidden sectors
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19h DWORD number of sectors on disk, 32-bit
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---function 01h---
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04h 20 BYTEs master IV for encrypted disk
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18h 64 BYTEs NDC/SHS keying information
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---function 02h---
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<p><b>04h WORD read-only state:</b><br>00h read-only, 01h read/write
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---function 03h---
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04h WORD drive number <a href="rb-2886.htm#Table1544" tppabs="http://www.ctyme.com/intr/rb-2886.htm#Table1544">(see #01544)</a>
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06h DWORD sector offset of logical volume from start of physical volume
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0 if logical volume = physical volume
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---function 04h---
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04h WORD mount status (00h unmounted, 01h mounted)
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---function 05h---
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04h WORD hotkey (high byte = shift state, low byte = scan code or 00h)
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<a href="rb-0045.htm#Table6" tppabs="http://www.ctyme.com/intr/rb-0045.htm#Table6">(see #00006)</a>
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0000h to disable hotkey
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---function 06h---
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04h WORD timeout in minutes before automatic unmount
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0000h to disable auto-unmount
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</PRE>
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<p><b>Notes:</b>
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The data for function 00h corresponds to a DOS BPB (see AH=53h).
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Functions 00h, 01h, and 03h automatically unmount the encrypted drive.
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Unmounting a drive with function 04h also destroys the encryption
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information in the driver and forces all dirty buffers to be flushed
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<PRE>
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<p>
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Bitfields for SFS drive number:
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<a name=table1544></a>
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Bit(s) Description (Table 01544)
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15-12 drive access mode.
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0000 BIOS access.
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0001 direct IDE access.
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0010 direct SCSI access
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---if BIOS access---
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11-8 unused (0)
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7-0 BIOS drive number
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---if IDE access---
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11-8 unused (0)
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7-0 IDE drive number
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---if SCSI access---
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11-8 SCSI host number
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7-4 SCSI target ID
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3-0 SCSI logical unit number
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</PRE>
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<p>
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<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
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Disk I/O Enhancements</a>
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- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
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Int 21h</a>
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