pjh@mccc.UUCP (Pete Holsberg) (01/25/89)
Is /dev/rdiskette on a 3B2/400 a 720K device, a 1.4M device, or a 1.2M device?
Thanks.
--
Pete Holsberg UUCP: {...!rutgers!}princeton!mccc!pjh
Mercer College CompuServe: 70240,334
1200 Old Trenton Road GEnie: PJHOLSBERG
Trenton, NJ 08690 Voice: 1-609-586-4800friedl@vsi.COM (Stephen J. Friedl) (01/27/89)
In article <581@mccc.UUCP>, pjh@mccc.UUCP (Pete Holsberg) writes: > > Is /dev/rdiskette on a 3B2/400 a 720K device, a 1.4M device, or a 1.2M device? Let's work it out: 80 tracks 9 blocks 2 tracks 512 bytes 737280 bytes --------- * -------- * -------- * --------- = ------------ drive track cylinder block drive So, it's 720k (but you only get to use 79 tracks...) Steve -- Stephen J. Friedl 3B2-kind-of-guy friedl@vsi.com V-Systems, Inc. I speak for you only attmail!vsi!friedl Santa Ana, CA USA +1 714 545 6442 {backbones}!vsi!friedl Nancy Reagan on these *stupid* .signatures: "Enough already, OK?"
scott@attcan.UUCP (Scott MacQuarrie) (01/28/89)
In article <581@mccc.UUCP> pjh@mccc.UUCP (Pete Holsberg) writes: > >Is /dev/rdiskette on a 3B2/400 a 720K device, a 1.4M device, or a 1.2M device? It's a 720K floppy. That's the common format for all 3B2's >Thanks. You're welcome -- ------- Scott T. MacQuarrie -====------ Senior Technical Consultant, Toronto Branch, AT&T Canada -======------ -====------- Phone: 416-756-5124 UUCP: ---------- CompuServe: 73677,102 uunet!attcan!scott or ------- ATTmail: !smacquarrie uunet!attcan!strider!scott P.S. Opinions expressed are my own and represent neither statement nor policy of AT&T or AT&T Canada Inc.
pjh@mccc.UUCP (Pete Holsberg) (01/29/89)
In article <1037@vsi.COM> friedl@vsi.COM (Stephen J. Friedl) writes: =In article <581@mccc.UUCP>, pjh@mccc.UUCP (Pete Holsberg) writes: => => Is /dev/rdiskette on a 3B2/400 a 720K device, a 1.4M device, or a 1.2M device? = = =Let's work it out: = = 80 tracks 9 blocks 2 tracks 512 bytes 737280 bytes = --------- * -------- * -------- * --------- = ------------ = drive track cylinder block drive = = =So, it's 720k (but you only get to use 79 tracks...) = Thanks to Steve and everyone else who posted the answer to my poorly phrased question. What I was really after was information on the technology of the media that can be used in 1 3B2 floppy drive. There was a discussion on comp.sys.ibm.pc about a year ago, but I've lost my notes from that. Anyway, to put things in context, my "question" was an attempt to make a poster think about the answer to that question. I already knew. Pete -- Pete Holsberg UUCP: {...!rutgers!}princeton!mccc!pjh Mercer College CompuServe: 70240,334 1200 Old Trenton Road GEnie: PJHOLSBERG Trenton, NJ 08690 Voice: 1-609-586-4800
rjd@occrsh.ATT.COM (Randy_Davis) (01/31/89)
In article <1037@vsi.COM> friedl@vsi.COM (Stephen J. Friedl) writes: |In article <581@mccc.UUCP>, pjh@mccc.UUCP (Pete Holsberg) writes: |> |> Is /dev/rdiskette on a 3B2/400 a 720K device, a 1.4M device, or a 1.2M device? | | |Let's work it out: | | 80 tracks 9 blocks 2 tracks 512 bytes 737280 bytes | --------- * -------- * -------- * --------- = ------------ | drive track cylinder block drive | | |So, it's 720k (but you only get to use 79 tracks...) | | Steve Well, to be exact, its 728,064 bytes, easily verified by doing a dd from either raw or block floppy device (with a formatted disk in the drive and the door closed) into a file. Randy Davis UUCP: ...(att!)ocrjd!randy ...(att!)occrsh!rjd