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- Newsgroups: comp.os.msdos.misc
- Path: sparky!uunet!cs.utexas.edu!swrinde!gatech!destroyer!cs.ubc.ca!news.UVic.CA!ugly!rhorner
- From: rhorner@ugly.UVic.CA (Roger Horner)
- Subject: Re: How to read MAC disks on PC?
- Message-ID: <1993Jan11.080613.13107@sol.UVic.CA>
- Sender: news@sol.UVic.CA
- Nntp-Posting-Host: ugl-gw.uvic.ca
- Organization: University of Victoria, Victoria, BC, Canada
- References: <817@ulogic.UUCP> <1993Jan8.225002.4186@aw2.fsl.ca.boeing.com> <833@ulogic.UUCP>
- Date: Mon, 11 Jan 93 08:06:13 GMT
- Lines: 33
-
- In article <833@ulogic.UUCP> hartman@ulogic.UUCP (Richard M. Hartman) writes:
- >In article <1993Jan8.225002.4186@aw2.fsl.ca.boeing.com> ckr2196@aw2.fsl.ca.boeing.com (Caryn K. Roberts) writes:
- >>From article <817@ulogic.UUCP>, by hartman@ulogic.UUCP (Richard M. Hartman):
- >>> PC disks are formatted in concentric circles. Mac disks are
- >>> formatted in a spiral (like your old black vinyl records). (This
- >>> is what let Macs put 800k on a floppy that the PC could only get
- >>> 720k on.) The Mac drive (actually the superdrive) can be controlled
- >>> to read concentric-formatted disks. I do not believe that there is
- >>> a way to control the standard pc drives to read spiral-formatted
- >>> disks. There may be special hardware out there that can do it.
- >>
- >>Mac disks are formatted just like MS-DOS disks except that density varies
- >>per track on Mac disks. In early Macs the disk speed was varied, but 800k
- >>and 1.44m discs accomplish this by varing the data read/write stream.
- >
- >Oh well, I got the details wrong. The concept -- that mac disks
- >used special formatting that standard ms-dos machines would be unlikely
- >to be able to read remains. Although apparently the more recent macs
- >have abandond the variable-speed drive concept and use more standard
- >formatting (from what I gather on the parallel leaf from my msg).
- >
- >Would it be possible to, on a track-by-track basis, change the
- ># sectors per track on an ms-dos floppy drive?
-
- The COPY II PC OPTION BOARD allows you to read and and write to MAC disks. It
- is connected between the controller and the drive. I guess it adjusts the
- speed of the drive. According to the back of the box it is supposed to be
- compatible with most software.
- --
- -------------------------------------------------------------------------------
- Roger Horner (rhorner@sirius.UVic.ca) University of Victoria
- 4th Year Electrical Engineering Student Victoria, BC, Canada
- If you don't like my spelling, use a real dictionary!
-