On Wed, Oct 21, 2020 at 8:11 AM André Fachat <afachat_at_gmx.de> wrote: > > > > Am 20. Oktober 2020 14:38:35 schrieb Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de>: > >> On 10/20/20 2:23 PM, Michał Pleban wrote: >>> >>> tokafondo wrote: >>> >>>> Does anyone has been able to transfer Commodore C900 disks to a 5.25" double >>>> density, double track disk? >>> >>> >>> What do you mean by "transfer the disks"? Do you mean using DSDD disks >>> instead if DSQD in the C900 floppy drive? it is possible just like with >>> the 8250, most DSDD disks can be formatted but they won't be very reliable. >> >> >> Never had a problem with using DSDD in a 8050 drive which is a 8250 with >> only a single head. there's no "QD" magnetic media, SD/DD/QD magnetic media was always the same (300 oersted). Probably the diskettes sold as QD/96 tpi were just higher quality. See here for all you ever wanted to know about floppy disks: https://www.retrotechnology.com/herbs_stuff/drive.html When I was at the university, we had a couple of Olivetti LSX 3xxx Unix servers, the consoles had 96tpi 5.25" disk drives (not the HD ones), I've seen only once a box of floppies certified for 96tpi, all the other media was regular DSDD 48tpi and most of those disks are still readable today (I've collected them when the machines were put out of service). I've had more failures on the 96tpi disks, interestingly enough. FrankReceived on 2020-10-21 10:00:03
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