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<TITLE>Int 41
</TITLE>
<META NAME="Description" CONTENT="
Int 41 - SYSTEM DATA - HARD DISK 0 PARAMETER TABLE ADDRESS [NOT A VECTOR!] -
Notes: the default parameter table array is located at F000h:E401h in 100%
compatible BIOSes; the pointer may be overridden by the hard disk
controller's BIOS to support drive formats unknown to the ROM BIOS
not used by some PS/2 models
BIOSes which support four hard drives may store the parameter tables
for drives 81h-83h immediately following the parameter table pointed
at by INT 41, with a separate copy of the drive 81h table for INT 46.
The check for such an arrangement is to test whether INT 46 points
somewhere other than exactly 16 bytes past INT 41, and the sixteen
bytes starting at offset 10h from INT 41 are identical to the sixteen
">
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<h2>Int 41
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<h3><font color=#C00040>SYSTEM DATA - HARD DISK 0 PARAMETER TABLE ADDRESS [NOT A VECTOR!]</font></h3>
<p><b>Notes:</b>
The default parameter table array is located at F000h:E401h in 100%
compatible BIOSes; the pointer may be overridden by the hard disk
controller's BIOS to support drive formats unknown to the ROM BIOS.
Not used by some PS/2 models.
BIOSes which support four hard drives may store the parameter tables
for drives 81h-83h immediately following the parameter table pointed
at by INT 41, with a separate copy of the drive 81h table for INT 46.
The check for such an arrangement is to test whether INT 46 points
somewhere other than exactly 16 bytes past INT 41, and the sixteen
bytes starting at offset 10h from INT 41 are identical to the sixteen
bytes pointed at by INT 46.
Another arrangement for BIOSes which support four IDE drives is to have
four tables pointed at by INT 41 in the order primary master,
primary slave, secondary master, and secondary slave, in which case
(for example) a system with only primary master and secondary master
will have valid tables at offsets 00h and 20h, with garbage (but
sectors-per-track = 00h) at offsets 10h and 30h
<p><b>See Also:</b>
#03196 - <a href="rb-0624.htm" tppabs="http://www.ctyme.com/intr/rb-0624.htm">INT 13/AH=09h</a> - <a href="rb-2445.htm" tppabs="http://www.ctyme.com/intr/rb-2445.htm">INT 1E</a> - <a href="rb-6184.htm" tppabs="http://www.ctyme.com/intr/rb-6184.htm">INT 46"HARD DISK 1"</a> - <a href="rb-6433.htm" tppabs="http://www.ctyme.com/intr/rb-6433.htm">INT 60"Adaptec"</
<p><b>See Also:</b>
<a href="rb-8390.htm" tppabs="http://www.ctyme.com/intr/rb-8390.htm">INT C0"AMI"</a>
<PRE>
<p>
Format of fixed disk parameters:
<a name=table3196></a>
Offset Size Description (Table 03196)
00h WORD number of cylinders
02h BYTE number of heads
03h WORD starting reduced write current cylinder (XT only, 0 for others)
05h WORD starting write precompensation cylinder number
07h BYTE maximum ECC burst length (XT only)
08h BYTE control byte <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 #03197,#03198)
09h BYTE standard timeout (XT only, 0 for others)
0Ah BYTE formatting timeout (XT and WD1002 only, 0 for others)
0Bh BYTE timeout for checking drive (XT and WD1002 only, 0 for others)
0Ch WORD cylinder number of landing zone (AT and later only)
0Eh BYTE number of sectors per track (AT and later only)
0Fh BYTE reserved
</PRE>
<p><b>See Also:</b>
#00273 - #00277
<PRE>
<p>
Bitfields for XT fixed disk control byte:
<a name=table3197></a>
Bit(s) Description (Table 03197)
2-0 drive step speed.
000 3ms.
100 200ms.
101 70ms (default).
110 3ms.
111 3ms
5-3 unused
6 disable ECC retries
7 disable access retries
<p>
Bitfields for AT fixed disk control byte:
<a name=table3198></a>
Bit(s) Description (Table 03198)
0 unused
1 reserved (0) (disable IRQ)
2 reserved (0) (no reset)
3 set if more than 8 heads
4 always 0
5 set if manufacturer's defect map on max cylinder+1 (AT and later only)
6 disable ECC retries
7 disable access retries
</PRE>
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