Re: Resend: Oceanic drive issues

Hi!,


The problem isn't really the head getting stuck or ending up at some 
inappropriate location, but some dust accumulated by the head. Quite 
some disks are in so bad condition by today that you could scratch the 
magnetic material off the disk surface even by your fingers. The same 
happens when you attempt to handle such disks in a drive. The material 
is caught up and accumulated by the head, which (in turn) makes most / 
any further disk operations impossible until a good cleaning. In Peter's 
case, the problem is likely also not mechanical, but the simple 
inability to catch any signal from the disks due to accumulated magnetic 
dust, thus, inability to identify any track positions (since that'd need 
reading the sector headers from the current track). Since the OC118 is a 
single headed drive (1541 clone), using head cleaner disks is not an 
option here so he'll need to take the drive apart anyway.


Levente


On 2015-07-15 00:15, william degnan wrote:
> dumb question - after cleaning the head did you try to format a disk?
> Sometimes that helps the heads return to the correct locations if
> they're off in a way that's not permanent.  There is also a "drive
> knock" program that I have used from time to time that jiggers the head.
>
> On Tue, Jul 14, 2015 at 6:00 PM, HÁRSFALVI Levente
> <publicmailbox@harsfalvi.net <mailto:publicmailbox@harsfalvi.net>> wrote:
>
>     Hi!,
>
>
>     http://retrotechnology.com/herbs_stuff/clean_disks.html
>
>     Our disks seem to hit the age... I archived some boxes of disks a
>     couple of months ago and had to clean the head between practically
>     every takes.
>
>     Unfortunately I can't already remember how to disassemble the '118.
>     (Haven't done so in the last probably two decades.)
>
>
>     Best regards,
>
>
>     Levente
>
>
>     On 2015-07-14 22:28, Peter Krefting wrote:
>
>         Trying again, as the mail server rejected my first attempt:
>
>         Hi!
>
>         I sat down copying disks yesterday evening, using my Oceanic
>         drive[1]
>         and a ZoomFloppy cable. After copying 40 or so disks, I ended up
>         with
>         one that was unreadable and had the read head "bump" a lot. I
>         aborted
>         the read, but after that I am unable to read any disks. It just
>         "bumps"
>         a bit and returns a 74 "drive not ready" error.
>
>         I tried opening it to see if it got stuck, but I only get to the PCB
>         side, and haven't quite figured out how to get to the head to
>         check it.
>         What should I look for? Is there a software way to force it to
>         unlock?
>         Have I forever destroyed the drive?
>
>
>
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>
>


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