lkml.org 
[lkml]   [2000]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Slow booting
Hi Alan.

>> type of floppy controller in the system (I don't know which). If
>> you boot from a floppy on a <200 MHz system it boots fine, an a
>> >300 MHz system it can take 5-10 min to read the image off of
>> the floppy before it starts to compress it.

> I see the problem on specific floppy controllers - notably the
> AHA1542 scsi controller has the problem. Its because we format
> all our floppies with an interleave of 1 while DOS tends to use
> 3 I believe

From experience, DOS varies in the interleave it uses depending on the
type of drive, the capacity of the disk, and whether it's a generic or
OEM release.

I've met all of the following:

1. Interleave 4 with Compaq OEM releases, and with 5.25" 1200k
drives formatting 720k floppies.

2. Interleave 3 with 5.25" 1200k drives formatting 360k or 1200k
floppies, and with 1440k 3.5" drives formatting 1440k floppies.

3. Interleave 2 with 5.25" 720k or 1200k drives formatting 720k
(80 track 9 sector) floppies, and with 3.5" drives formatting
720k floppies.

4. Interleave 1 with 2880k 3.5" drives formatting 1440k or 2880k
floppies.

Note especially the last one - it means that 1440k floppies formatted
on a 2880k drive are considerably slower to read in a 1440k drive than
the same disk formatted in a 1440k drive.

However, with that exception, Dos doesn't use an interleave of 1, as
you state.

Best wishes from Riley.

* Copyright (C) 1999, Memory Alpha Systems.
* All rights and wrongs reserved.

+----------------------------------------------------------------------+
| There is something frustrating about the quality and speed of Linux |
| development, ie., the quality is too high and the speed is too high, |
| in other words, I can implement this XXXX feature, but I bet someone |
| else has already done so and is just about to release their patch. |
+----------------------------------------------------------------------+
* http://www.memalpha.cx/Linux/Kernel/


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:56    [W:0.047 / U:0.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site