On 5/30/2006 at 6:18 PM Al Kossow wrote:
Like it or
not, I'm using ImageDisk as the standard to store and access
That should be fine for most soft-sectored formats. At this point it's
more important to get the bits into some form that preservation through
replication can start. It would be a good thing to start fingerprinting
files with MD5 checksums and building a data base of known good images.
I would strongly advise against using any sort of "smart" controller
(WD179x, NEC 765 family, etc.) as an archival way to preserve media. Any
program using controller chips will lose everything that occurs outside of
the expected sectors. For example, many WD controllers could and did
format tracks without IAMs, which more often than not means that the first
sector on the track will be missed. And a 765 can't be made to reliably
read the IAM.
Further, there are copy-protection schemes that are sometimes very bizarre.
For example, early editions of Harvard Graphics placed an identifying
string in the inter-sector gap.
Of course, this isn't even going to save you in the case of Apple ][
half-tracked protection, but you'll be closer to retaining an accurate
image in all cases, even if it does occupy 3 or more MB per diskette if you
keep, say, a Catweasel image of what you want to preserve.
...and be sure to select the highest practical clock frequency on the
Catweasel that you can to sample--it makes a difference in the recovery of