On Mon, 6 Sep 1999, Steve Judd wrote: > Hi Bill, > > On Fri, 3 Sep 1999, William Levak wrote: > > > HD disks use a magnetic particle that requires a higher electic field to > > write them. In addition, the write head is narrower. If you use a SD, > > DD, or QD disk in a HD drive, the higher electric field will cause the > > signal to be spread over adjacent tracks. If you format a DD disk to a DD > > capacity in a HD drive, then you will be able to read and write it because > > of the greater spacing between tracks. You will, however, only be able to > > use it in a HD drive because the main signal is too narraw to be read > > reliably by a DD drive. > > This seems backwards to me, and runs counter to my experience. I would > think that the lower current of a DD head would mean that sometimes the > HD head has a problem reading it. The two situations are different. The read heads on a HD drive are sufficiently sensitive to read DD disks. The problem comes in writing. Also 5.25 drives are different than 3.5 drives. HD 3.5 drives have a density select line that selects between writing in DD or HD mode. 5.25 drives do not have this. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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