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- Path: sparky!uunet!cs.utexas.edu!sun-barr!rutgers!flop.ENGR.ORST.EDU!xanth.CS.ORST.EDU!villalj
- From: villalj@xanth.CS.ORST.EDU (John Villalovos)
- Newsgroups: comp.os.msdos.misc
- Subject: Re: Using HD disks as DD disks
- Keywords: disks, disk drive
- Message-ID: <1hb8h7INN4t6@flop.ENGR.ORST.EDU>
- Date: 24 Dec 92 02:50:15 GMT
- References: <jeric.67@berkp.uadv.uci.edu> <1992Dec23.202219.114@cbnewsm.cb.att.com>
- Distribution: usa
- Organization: Oregon State University
- Lines: 43
- NNTP-Posting-Host: xanth.cs.orst.edu
-
- In article <1992Dec23.202219.114@cbnewsm.cb.att.com> evans1@cbnewsm.cb.att.com (Dan Evans) writes:
- >In article <jeric.67@berkp.uadv.uci.edu> jeric@berkp.uadv.uci.edu (Jeric Woo) writes:
- >>I have some high density 3.5" and 5.25" diskettes that I would like to
- >>use as low density diskettes. However, whenever I attempt to format them
- >>(using low density drives) I get either the messages "Bad or Invalid Media"
- >>or the message "Track 0 Bad, Disk Unusable."
- >>
- >>Why can't I do so? Are the any other physical differences between high
- >>density diskettes and low density diskettes (I know that 3.5" HD has a hole
- >>at the upper left hand corner, and that maybe HD disks has higher "surface
- >>density"). I even ran the diskettes through a magnet before formatting
- >>them, but still no luck. Thanks!
- >>
-
- Yes there are physical differences in the media. The differences are more
- apparent on 5.25" diskettes then on 3.5".
-
- >The LD drive heads are larger then the HD heads. As a result the LD heads
- >are reading more then one track at a time on the HD disk. Track 0 isn't
- >bad, it's just smaller then the LD drive is capible of reading it.
-
- I don't believe that is correct. If you look at a floppy disk they aren't
- composed of tracks of magnetic media. The media is a continuous (sp?)
- coating on the disk.
-
- >You can format the HD disks in the LD drive but you must either use virgin
- >disks (aka. never been formatted as HD) or completely erase the treacks
- >from the HD disk before formatting it in the LD drive.
- >
- >You may get away with using a real strong magnet, a disk erasing utility
- >sush as bulkeras from copyiipc version 6 will definately do the trick.
- >I've trashed disks before that had the "Track 0 Bad, Disk Unusable."
- >when I tryed formatting them. Bulkeras fixed it up for reformatting again.
-
- Usually with 5.25" disks you will end up with problems. 3.5 disks you might
- be able to get away with it.
-
- Later,
- --
- John Villalovos
- Certified Netware Engineer
- villalj@xanth.cs.orst.edu
- (503) 753-7883
-