Date sent: Mon, 6 Sep 1999 20:19:00 -0600 (MDT) From: Steve Judd <sjudd@trail.com> To: cbm-hackers@dot.tcm.hut.fi Subject: RE: CBM 8280 Send reply to: cbm-hackers@dot.tcm.hut.fi > 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. > > I use my Amiga (DD) to transfer files to my FD2000 (HD) drive, using > Pasi's c1581. It is never a problem reading files that the FD has > written. I do, however, sometimes have problems reading files on the FD > that the DD Amiga has written -- the files are perfectly readable on the > Amiga, but generate a read error on the FD. And once the read error > exists, only reformatting the disk will make it go away. > Actually, I wrote a program to fix read CRC read errors on FD2000 disks FYI. Don't know what kind of errors you've had. > Anyways, I've never had problems reading DD files/disks created on > the HD drive, but I've had numerous problems going the other way. > > > for secret information. Military security protocols specify that a disk > > containing secret information must be overwriten a certain number of > > times with random data in order to obliterate the residual signal. Or, > > you can bulk erase it. > > Or burn it. > How fast can you burn a disk? (LOL) Seriously though, for fun. What do you think? Dunno what those things are made of. - 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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