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- Path: enea.se!not-for-mail
- From: olli@enea.se (Ola Liljedahl)
- Newsgroups: comp.sys.amiga.misc,comp.sys.amiga.hardware
- Subject: Re: File copying problems
- Date: 29 Mar 1996 23:43:19 +0100
- Organization: Enea OSE Systems AB; "OSE - Design on a higher level"
- Message-ID: <4jhp27$nvd@gordon.enea.se>
- References: <4jhar1$4j0@leofric.coventry.ac.uk>
- NNTP-Posting-Host: gordon.enea.se
-
- ctc@coventry.ac.uk (C.H.E.B.) wrote:
- #1
- > I download files on my Uni computers and transfer them to my Amiga 1200 on
- > LD PC disk. Often the file did not come though. I put this down to dodgy
- > Uni disk drives.
- >
- #2
- > I've now noticed that files are often chewed when a straight copy takes
- > place on my hard drive. Any ideas?
- >
- #3
- > I've had this problem since before I bought a Blizzard 030 accellerator
- > with 4Mb RAM, but the copying problem does seem to disappear in the main
- > when I turn the board off.
- >
- #4
- > Anyone got any ideas? I have replaced copy in C: from the one off my
- > original workbench disks as well as from a coverdisk and this has not
- > solved the problem. The problem seems particularly accute when copying
- > largish files.
- >
-
- Regarding problem #2:
- A1200 => IDE disk interface
- copy large files => they "get chewed"
- Chris, from your description this really points into one direction:
- Your disk's MaxTransfer value is too large. You are trying to transmit more
- data to disk than it can consume at one time. Try lowering your MaxTransfer
- value, it should be (512 bytes less?) than your disk's transfer cache, i.e.
- 0xFE00 for a 64K cache and 0x1FE00 for a 128K cache. You can safely try even
- smaller values. All of this can be accomplished with HDToolBox or maybe with
- some other RDB changing utility.
-
- Problem #1 could have to do with this also. Copying from the diskette to the
- hard disk could read and buffer a large amount of data and write it all in one
- operation to the hard disk. Resulting in the same problem as in #2. Maybe.
-
- Fact #3 AFAIK doesn't have anything to do with this. Maybe.
-
- Solution #4 doesn't work, because the error doesn't lie with the copy command.
-
- I had a similar problem with my Maxtor 540M HD in my A3000. The HD didn't like
- the flaky relesection implementation in the SCSI (WD -04) chip and gave me SCSI
- bus lockups and chewed files when reading/writing large files. Disabling
- reselection solved the problem. AFAIK this a known problem with many A3000's
- and it's SCSI chip.
-
- Disclaimer: sometimes I am dead wrong. Maybe.
-
- Regards,
-
- Ola Liljedahl
- olli@enea.se
- "OSE - Design on a higher level"
- "OSE - Already in cellular phones close to your ear"
- "OSE - Soon coming to more embedded computers near you"
-