ulf@pro-generic.cts.com (Ulf Danus) (06/21/89)
Network Comment: to #2537 by pnet01!crash!cunyvm.cuny.edu!STEIN%UCONNVM.BITNET
Did any notice that they are selling 5.25 double sided drive? They
claim that it is fast and can store twice as much as the normal drive. Has
any one used it? I am considering buying it since I don't have an external
drive for my //c and I only have the built-in drive and a genuine Chinook hard
drive.
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|_________________|daveharv@pro-novapple.UUCP (Dave Harvey) (06/25/89)
Network Comment: to #7480 by obsolete!pro-angmar!pro-generic!ulf The drive they sell, if I remember correctly, is just a drive with two heads on it. You don't have to turn the disk over to access the other side. That's all there is to it. It's not made so that you can access one contigious block of data. It just saves you the hassel of removing the diskette, turning it over and reinserting. proline: pro-novapple!daveharv uucp: crash!pro-novapple!daveharv arpa: crash!pro-novapple!daveharv@nosc.mil Internet: daveharv@pro-novapple.cts.com DIALCOM: 164:NVC100 Northern Virginia Apple Users Group >pro-novapple< 703-671-0416/300-2400 baud
saw@pro-abilink.UUCP (Alan Woods) (06/26/89)
Network Comment: to #5711 by obsolete!pnet01!pro-novapple!daveharv%nosc.mil
If memory serves correctly...
...according to a rep from QC that presented the drive to an Apple User
meeting in Dallas last month, the drive does have two heads, and it can be
used as two volumes, similar to "flippies". The only problem with this is
that the second side will spin in reverse when placed in a drive upside down
the way most flippies are used. But there is a switch on the front that
allows the drive to format both sides as one volume of about 280k. The OS
must be patched I think, but it will see it as a larger 5" drive.
Alan Woods
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ICBM: N32-26.485 W99-42.035 WGS-72 <--- (Thanks, Vic!:)JerryK@cup.portal.com (Jerry E Kindall) (06/27/89)
Quality Computer's disk drives are definitely double-sided. They have a 320K capacity, and they automatically use both sides of the disk (40 tracks per side). They also automatically detect disks formatted for 35 tracks and will read and write them without any problems. The switch on the front which switches between the heads will not allow you to access both sides of a flippie disk without flipping it -- the switch changes heads, but it doesn't make the drive motor go the other way. Sure would be nice if it did, though! /\ Jerry Kindall JerryK@cup.portal.com \/ Death to COBOL GEnie: A2.JERRY ALink: A2 Jerry
dseah@wpi.wpi.edu (David I Seah) (06/28/89)
In article <8906250736.AA14091@crash.cts.com> pnet01!pro-sol!pro-charlotte!pro-novapple!daveharv@nosc.mil writes: >Network Comment: to #7480 by obsolete!pro-angmar!pro-generic!ulf > >The drive they sell, if I remember correctly, is just a drive with two heads >on it. You don't have to turn the disk over to access the other side. That's >all there is to it. It's not made so that you can access one contigious block >of data. It just saves you the hassel of removing the diskette, turning it >over and reinserting. Somethings fishy. Assume that you are using a disk that you normally flip over to work with the other side (something like AppleWorks on 5.25"). Isn't that second side going to have the datastream recorded in the opposite direction relative to the first side? SIDE ONE [head] data direction ------> Apple II style, flippy disk data direction <------ SIDE TWO SIDE ONE [head] data direction ------> IBM-PC style, double sided disk. data direction ------> SIDE TWO [head] It would seem for this drive to work, it would have to reverse the disk direction everytime it flipped sides, or somehow be able to decode Apple's disk format backwards. It probably is just like the IBM style drive with a ProDOS driver. Dave Seah | O M N I D Y N E S Y S T E M S - M | Internet: dseah@wpi.wpi.edu | "User Friendly Killing Machines" | AlinkPE: AFC DaveS | A Division of SLO, International | Bitnet: dseah@wpi.bitnet
ulf@pro-generic.cts.com (Ulf Danus) (07/04/89)
Network Comment: to #2699 by pnet01!crash!trout.nosc.mil!pnet01!pro-novapple!daveharv
So Dave, tell me now, do you think that data written by the Double Sided Drive
can be read by a normal //c built-in drive?
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