Re: Disk Muncher

[nospam@pd.jaring.my (Lincoln Yeoh)]

On Wed, 20 Jan 1999 02:28:08 +1100, richard.b@genie.com (Richard Bennett)
wrote:

>All versions of Disk Muncher disabled checksum and trailer validation,
>making disk copying completely unreliable yet to the naive seemingly
>faster and more reliable. Serves anyone right who actually used the thing.

Completely unreliable? Far from it. When the disk drives became more
reliable (not the old fat 5.25 inch drives with that big metal disk at the
bottom) the checksums weren't needed as much (I doubt even the old drives
were that unreliable). In most cases the copy protected disks stuck to the
basic Apple format and just changed the D5AA96 part (main header start
marker) to something different (e.g. BBAAD5). It was mainly the D5AA96 and
D5AAAD (end marker) which counted. The D5AAEBs (subheader markers) were
mostly not important (Woz very conservative?). In many cases they still
used the same checksum method for the data.

Hmm, interesting what sticks in the brain. Ah, nostalgia :). 

Cheerio,

Link.
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