Warning! Catweasel-modded PC-5.25"-drive may destroy your 1541 disks!
If you own a Catweasel controller for your Amiga or PC, I have to warn you that the drive modification recommended on Jens Schoenfelds' homepage necessary for reading 1541 disks are dangerous for your datas' health! The homepage says, you have to modify the drive so it can read the second disk side for c64 disks. Well, that's true, but the modification itself is dangerous for your data - you are advised to glue a magnet and a reed contact to the drive motor / and nearby the drive motor. Sounds all fine, seems to be too "inside" (Track 40, eh?) to do any damage to the data, but when you actually _insert_ a disk, the motor with the data-deadly magnet is already spinning, thus the magnet is moving dangerously near your data... I lost some of my best utility disks this way. They now contain 23 read errors all over the place. Typically, they contain one 23-read-error every track between track 6 and track 20. This supports my theory that these errors occur as soon as the disk is inserted into the modified PC disk drive. I found out that when transfering with Star Commander, I had had much fewer read errors (but I tried other disks with SC first). Rechecking with a real c-64 the acutal transfered disks, to my dismay the readerrors displayed by the Catweasel transfer tools actually were now really there! Thus my recommendation is to modify your PC drive another way. Mounting a magnet inside a disk drive is no good idea, whatsoever. I'll inform Jens soon.
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ATT
8/6/2005 7:25:48 PM
comp.sys.cbm
14233 articles. 
0 followers.
dunric
4 Replies
418 Views
ATT wrote: > If you own a Catweasel controller for your Amiga or PC, I have to warn you > that the drive modification recommended on Jens Schoenfelds' homepage > necessary for reading 1541 disks are dangerous for your datas' health! > > The homepage says, you have to modify the drive so it can read the second disk > side for c64 disks. Well, that's true, but the modification itself is > dangerous for your data - you are advised to glue a magnet and a reed contact > to the drive motor / and nearby the drive motor. > > Sounds all fine, seems to be too "inside" (Track 40, eh?) to do any damage to > the data, but when you actually _insert_ a disk, the motor with the > data-deadly magnet is already spinning, thus the magnet is moving dangerously > near your data... > > I lost some of my best utility disks this way. Might it be that you used too big/strong magnet piece?
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silverdr
8/7/2005 10:44:54 AM
This might be a longshot, and maybe some people may come to the conclusion that I have no idea what I'm talking about. Can't you use an electro magnet instead of a permanent one, one with a comparable magnetic power? This way you can hook the magnet up to the drive door which powers on the magnet when the door is closed. -R-
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Jurgen
8/8/2005 8:20:46 AM
Jurgen Haan wrote: > This might be a longshot, and maybe some people may come to the > conclusion that I have no idea what I'm talking about. > > Can't you use an electro magnet instead of a permanent one, one with a > comparable magnetic power? This way you can hook the magnet up to the > drive door which powers on the magnet when the door is closed. Might get difficult to wire the coil located on a rotating base... Actually the best (which I thought of) way to do it would probably be to use optical method with a black-matte adhesive tape attached to the side of the rotating cylinder and a small piece of reflective one. Similar to what Video 2000 VCRs used to detect EOTape. That's the way I once wanted to do the mod but then, of course, never did... ;-)
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silverdr
8/8/2005 4:42:38 PM
Okay, I did a systematic research into the matters of Catweasel suspected problems. The first problem I encountered was that it even seemed to be unreliable to simply display the 1541 disk directory via the PC and Catweasel. Sometimes, the directory would show up, sometimes not. (Well, not to mention the false alarm about lost data on 1541 disks - it turned out to be the fault of a bad PC disk drive.) When exchanging the PC 5.25" floppy disk drive, these problems were gone. Then I decided to add the magnet and reed contact to the new PC floppy disk drive. Suddenly, I got reading problems again ; thus, I conclude my reed contact is somewhat inadequate and misses the rotating magnet many times. I do not have an oscilloscope to verify this hypothesis, but I'm quite sure. If someone can recommend a certain brand of reed contacts in order to properly modify the PC floppy disk drive, please let me know; please also let me know if there is another way to modify that drive so it can read both 1541 disk sides. I spent over 9 hours to come to this conclusion; I tried several disks, several PC drives, I re-checked the data validity on the c64/1541, etc. Sorry for the inconvenience. Any advice is greatly appreciated. Alas, I also couldn't find any link of how to avoid the "Reed/magnet"-solution and use something more reliable?
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AT
8/9/2005 7:17:39 PM
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Just posted three floppy drives in great condition on eBay. Picture included there. Coming soon are a great condition Woz IIgs with a ROM 3 motherboard, keyboard and mouse. Two 800K Apple 3.5" drives (Model A9M0106) http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5138505195&ssPageName=STRK:MESE:IT One 140K Apple 5.25" drive (Model A9M0107) http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5138507329&ssPageName=STRK:MESE:IT Thanks... ...
How to connect a 5.25" drive to a PC and transfer discs!
Hi There I think this question has been asked before!!! But i hope someone can help me. A friend of mine and I have dug out our collection of old 5.25" discs from the CPC era! Together we have about 600-700 'old' 5.25" discs. They seem to be in perfect condition, stored in a dry cool place for about ehhh... 10 years or more! It is not an option to get the images directly from a real CPC, because we are far away from a real CPC! But we have a 5.25" drive and now the question: Is there a way to connect the 5.25" to a PC (Windows XP or Linux) and dump...
BBC Computer 5.25" disk drive question
Would a PC 5.25" 1.2Mb drive work with a Beeb? I've just bought a BBC B from eBay that's turned into somewhat of a dog. Luckily I have a spare untidy BBC so I've put all my working bits together in one case to come up with a BBC+ 64K with 1770DFS. I have a bunch of floppies including Elite and Aviator but the drive that came with the system is also toast - while the drive spins the read/write head doesn't move. Can I do a swap for a PC 1.2Mb 5.25" drive? If so, does anyone from Australia have one to sell me or know where I can get one? The package I bought...
two 1541 disk drives with 36 5.25 floppies
on e-bay item 260131312542 starts at 19.95 both drives are in good condition. shipping extra. ...
aligning the heads on a 5.25" floppy disk drive
I have a couple of old 5.25" drives which are having trouble reading some archive 5.25" floppy disks (these disks read fine on other equipment). Is there any way to adjust/align these disk drives to try to get them to work better? If anyone could provide links to FAQs or website please. I Googled but didn't find any useful info. Thanks. EtherJones@yahoo.com schrieb: > I have a couple of old 5.25" drives which are having trouble reading > some archive 5.25" floppy disks (these disks read fine on other > equipment). > > Is there a...
portable external 5.25" floppy disk drive
Hi, Recently there was a long thread here on the desire for a USB external 5.25" floppy disk drive. I do not have one of those, however, I did find in my stack of stuff a portable external 5.25" floppy disk drive made by "CMS Enhancements". It is model EF360U and is available on the surplus computer equipment market. http://search.yahoo.com/search?p=EF360U&fr=yfp-t-471&toggle=1&cop=mss&ei=UTF-8 My drive has what *APPEARS* to be a parallel port interface. I am not 100% certain as it could be a proprietary interface (card required) or it may even be SCSI...
Web resources about - Warning! Catweasel-modded PC-5.25"-drive may destroy your 1541 disks! - comp.sys.cbmResources last updated: 2/15/2016 3:23:13 PM