Path: utzoo!attcan!uunet!mcvax!unido!fauern!faui44!mlelstv
From: mlelstv@faui44.informatik.uni-erlangen.de (Michael van Elst )
Newsgroups: comp.sys.amiga
Subject: Re: Request to Commodore (Fast File System)
Message-ID: <625@faui44.informatik.uni-erlangen.de>
Date: 6 Sep 88 12:35:00 GMT
References: <8808291950.AA12753@cory.Berkeley.EDU> <4604@cbmvax.UUCP>
Reply-To: mlelstv@faui44.UUCP (Michael van Elst (kdebugger))
Organization: CSD., University of Erlangen, W - Germany
Lines: 23

In article <4604@cbmvax.UUCP> daveh@cbmvax.UUCP (Dave Haynie) writes:
> [ comments about FFS that has no DOS checksums on data blocks ]
>.......  However, with a floppy, there is no underlying hardware error
>checking logic; the checksum is all you get. 
>-- 

I think you are wrong. I would agree that the data integrity is not
checked very well. BUT trackdisk.device uses a parity check on each
sector as well as on each sector header.
You GET error messages from trackdisk if a block is wrong. And trackdisk
does nothing with the DOS checksum.
Trackdisk.device rejects complete tracks if only one sector is bad.
(I verified this with a RAW_READ call and then decoding MFM data). Could
anyone think to implement this in 1.4 ?

BTW, some friends have improved the DiskSalv program to get all readable
sectors from a bad track.

				Michael van Elst

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