[EMAIL PROTECTED] ha escrito: > Getting back to disk life span, I was very recently commissioned to > recover > data from some 16 Apple II disks that are about 20 years old. When they > arrived, it turned out that only 7 actually were Apple II disks. The other 9 > were MS/DOS disks. The only ones I had a problem reading some sectors from > were three of the MS/DOS disks.
That's because of the data encoding schema used by PC's and Apple ]['s drives. PCs use the (almost standard) MFM encoding, while the Apple ][ use Woz's designed GCR (correct me if that's not the name - I'm sooo bad remembering exact data... :-( ). It turns that, at the same media density, GCR is more reliable than MFM. I remember my college days, when people said 3.5" PC disks were "reliable" because they failed less than 5.25" disks. Sometimes I had to try hard not to laugh at they faces and say that I hadn't had a single diskette failure in more than ten years. Greetings, Antonio Rodr�guez (Grijan) <ftp://grijan.cjb.net:21000/> -- Apple2list is sponsored by <http://lowendmac.com/> and... / Buy books, CDs, videos, and more from Amazon.com \ / <http://www.amazon.com/exec/obidos/redirect-home/lowendmac> \ Support Low End Mac <http://lowendmac.com/lists/support.html> Apple2list info: <http://lowendmac.com/lists/apple2.html> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/apple2list%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
