On 26/08/2014 11:47 AM, William Levak wrote: > > It's been a long time since I worked on drives like this. There are > two kinds of format. Normal high level format and low level format. > Low level format can sometimes be done from BIOS, but sometimes it was > done from a routine on floppy disk. I remeber that at least some > Western Digital drives did the low level format from routine on floppy > disk. > > Most commands from the disk controller assume a low level format. If > the low level format is corrupted, it returns read errors. > > If the first sector on the disk is bad, nothing can be done. If you > get read errors on sector 2, you can set sector 2 bad in the low level > format and bypas it. > > If you cannot do a low level format, you have mechanical or electrical > problems. > > There are utility programs that will read any sector on a hard drive > directly, ignoring the directory and partition tables. I don't have > one that works on SASI drives. > If there is a low level formatting program in the controller ROM it should be easy to find in the controller ROM dump with a hex editor. Message was sent through the cbm-hackers mailing listReceived on 2014-08-26 05:00:03
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