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| Title: | Atari ST, TT, & Falcon |
| Notice: | Please read note 1.0 and its replies before posting! |
| Moderator: | FUNYET::ANDERSON |
|
| Created: | Mon Apr 04 1988 |
| Last Modified: | Tue May 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1433 |
| Total number of notes: | 10312 |
1276.0. "SH205 FAT corruption problem" by KERNEL::IMBIERSKI (The sound of electric wood) Mon Apr 06 1992 07:00
This is going to be a bit long, but if any ST file system gurus could
have a read and give me some advice I'd be very grateful!
I'm trying to use an SH205 hard disk with an old STFM running 1.0 TOS
(in ROM) and (I think) 1.2 GEMDOS, and 3.01 of AHDI. The disk was
second hand and had software already on it which loaded and ran
perfectly. However, when I tried to save my own files to the disk it
rapidly corrupted to such a state that I had to reformat. I put more
files on the disk after reformatting and these too became corrupt,
including directories.
At this point I decided some in-depth troubleshooting was required so I
reformatted the disk, copied ONE file to it and loaded up KNIFE-ST from
floppy. What I found was that the list of clusters for the one file in
the FAT ended with ZERO for the last cluster, instead of -1 which (I
thought) should designate the last cluster in the chain. The data
content of the file itself was all there on disk, with the EOF marker
in the cluster marked as 0 in the FAT.
Now a forward pointer of 0 in the FAT means "this cluster is unused" so
clearly, when I copied other files to the disk, this cluster got
re-used by another file, and my first file was corrupt.
Just to try and make this clear, my expected layout of a FAT chain
would be something like:
Cluster 1, Cluster 2, Cluster 3, Cluster 4, Last Cluster
0002, 0003, 0004, 0005, FFFF
what I see on the SH205 is:
Cluster 1, Cluster 2, Cluster 3, Cluster 4, Last Cluster
0002, 0003, 0004, 0005, 0000
Note the hard disk uses 16 bit fat entries. My floppies work fine (they
have 12 bit FAT entries).
So, the questions that come to mind are:
1). What part of the operating system is responsible for building the
FAT chain. (TOS?).
2) If I need a TOS upgrade, is it still possible to get roms for, say,
1.4?? If so what is the typical cost?
3) If I patch into the BPB routine and make it report 12 bit FAT
entries instead of 16, will this cause other problems??
4) Would the version of AHDI have any effect??
Hope someone can help!!
Tony I
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1276.1 | | KERNEL::IMBIERSKI | The sound of electric wood | Tue Apr 07 1992 06:18 | 11 |
| Well, I'll answer my own note in case anyone else is interested!
I've spoken to a UK company, Ladbroke computing, who agreed that a TOS
upgrade would be a good thing to try. However other "technical support"
people have suggested it will either be a DMA or a controller problem.
As I see it, though, the DMA and the controller do not know anything
about the FAT. Surely this must be handled within TOS? Can anyone
comment on this before I spend my money??
Tony I
|
| 1276.2 | try another driver | UFHIS::BFALKENSTEIN | | Tue Apr 07 1992 10:20 | 16 |
|
I'd go for a new TOS version, though I would also try out another
Harddisk-driver first. These are floppy-based and so easier to get...
I had a similar problem when I used CBHDI (another driver) and formatted
one partition for use with ATonce and MS-DOS. This didn't work!
After installing MS-DOS on the DOS-formatted partition I just could
boot DOS once and then never again because all the files in the
DOS-directory were corrupted after the first boot-up. Formatting the
drive with the Atari-driver (AHDI) did the job. When I looked at the
boot- and rootsectors I found 3 partitions with the ID Atari with
start- and ending sectors that were ok and another three partitions
with negative startsectors and the ID "Scheibenkleister" from CBHDI.
So, although I formatted the drive with HDX there still was a mess in
the boot- and rootsectors from CBHDI...
Bernd
|
| 1276.3 | | KERNEL::IMBIERSKI | The sound of electric wood | Tue Apr 07 1992 10:56 | 12 |
| thanks for the reply, Bernd.
what other HD drivers are there? I'm a bit new to hard drives. I'm
using Atari's AHDI which came with the drive, but I have seen mention
of a SUPRA driver in this conference. Are these other drivers usable on
an atari disk or are they specific to particular hardware??
Are there any drivers I can pick up off the network??
cheers,
Tony I
|
| 1276.4 | | CMOTEC::HARRISON | | Tue Apr 07 1992 11:22 | 8 |
|
Hi,
I've got the ICD set of programs, including hard disk driver,
I don't know if they would be of use to you ?
Brynn.
|
| 1276.5 | update | KERNEL::IMBIERSKI | The sound of electric wood | Wed Apr 08 1992 09:20 | 14 |
| well.....
the lastest update on this is that I tried the hard disk on a friend's
ST and it works PERFECTLY. His machine is even older than mine and has
the same ancient TOS version.
So, even though I can't understand how it could possibly happen, this
must be down to a hardware problem in my ST. Now the only obvious
culprit must be the DMA chip, or is there anything else I should
check??
Confused!
Tony I
|
| 1276.6 | DMA chip is a good guess | PRNSYS::LOMICKAJ | Jeffrey A. Lomicka | Wed Apr 08 1992 17:48 | 9 |
| The DMA chip is a good first guess, and is easily replaced
speculatively. I have fixed many weird disk problems by replacing the
DMA chip.
Also, if you have never used a hard drive before, it may be a
simple as spraying some contact cleaner on the DMA port, as it may have
corroded after years of not being used.
|
| 1276.7 | fixed! | KERNEL::IMBIERSKI | The sound of electric wood | Fri Apr 10 1992 06:11 | 15 |
| I've fixed my Hard Disk problem....
I bought another ST!
I got so fed up with this problem I didn't want to spend any more money
without guaranteeing a fix. STFM's are so cheap on the second hand
market I decided to just buy another and have done with it (After
trying out my Hard Disk with it, of course). The "new" machine cost
about twice what most repair companies quoted my to fix my old one.
Thanks to everyone who helped me with this, especially Brynn!
Cheers,
Tony I
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