In a message dated 2/28/03 12:13:40 PM, [EMAIL PROTECTED] writes: << I thought the 400K were MFM (single sided) and 800K could be either MFM or HFS (double sided) depending on era, and 1.44s were HFS (double side high density) >>
400 K = single sided, GCR encoded using the IWM chip. 96 tracks per inch. 250 kHz clock rate. 800 K = double sided, GCR encoded using the IWM or SWIM chip. 96 tracks per inch. 250 kHz clock rate. 1.44 MB = double sided, MFM encoded using the SWIM chip. 96 tracks per inch. 500 kHz clock rate (hence, high density, but the encoding is still considered double density; FM is single density). Low level track format identical to the IBM PC's 1.44 MB floppy. Logical track format is different, of course, and is unique to Apple. IIRC, of course. -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> 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/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
