* Mr. Drill Press enter the chat *
Mrs. Dectape laughs at your attempts :-)
C
:)
g.
On Fri, Mar 24, 2023 at 12:17 PM geneb via cctalk
wrote:
> On Fri, 24 Mar 2023, Tom Gardner via cctalk wrote:
>
> > Well the data are still there and could be retrieved with a
> sophisticated servo on data system and/or a probe head on the data surfaces.
> > Simpler to hit the spindle motor top
On 3/24/23 12:17, geneb via cctalk wrote:
> On Fri, 24 Mar 2023, Tom Gardner via cctalk wrote:
>
>> Well the data are still there and could be retrieved with a
>> sophisticated servo on data system and/or a probe head on the data
>> surfaces.
>> Simpler to hit the spindle motor top dead center
On Fri, 24 Mar 2023, Tom Gardner via cctalk wrote:
Well the data are still there and could be retrieved with a sophisticated servo
on data system and/or a probe head on the data surfaces.
Simpler to hit the spindle motor top dead center with a very large hammer
ruining the bearings and
are still there so nothing beats a multi-pass full disk wipe
-Original Message-
From: Chris Zach [mailto:c...@beaker.crystel.com]
Sent: Thursday, March 23, 2023 9:53 AM
To: cctalk@classiccmp.org
Subject: [cctalk] Re: Nuking an MFM drive with a magnet, format/servo gone?
Speaking from
Speaking from experience with an old RD54, yep. Put a magnet on the
outside case towards the bottom, spin the drive up and it's gone forever.
On 3/23/2023 12:22 PM, Daniel Daigle via cctalk wrote:
Old MFM/RLL drives with stepper positioners generally have no servo. The same
can't be said of
Old MFM/RLL drives with stepper positioners generally have no servo. The same
can't be said of voice-coil positioned drives; they could use any means,
including hardware optical servos, etc. but often used a surface and a head for
that purpose... so yes, you can render one of these drives
On Sun, Feb 5, 2023 at 11:12 AM emanuel stiebler via cctalk
wrote:
> Keep "all" magnets away from disks :)
The hubs of 3.5" floppy disks and of the disk packs used in RK05s,
RL01s/02s, RK07s, etc are locked to the spindle by a ring magnet.
-tony
On 2023-02-03 21:28, Chris Zach via cctalk wrote:
Perm magnet. Those neodynium magnets are powerful, keep them away from
disks.
Keep "all" magnets away from disks :)
Perm magnet. Those neodynium magnets are powerful, keep them away from
disks.
C
On 2/3/2023 9:26 PM, Tom Hunter via cctalk wrote:
Chris, what kind of magnet did you use?
If it was an electromagnet I could imagine that you caused physical damage
by something heating up sufficiently. If it was
On 2023-02-03 11:57, Chris Zach via cctalk wrote:
This is a Maxtor 2190. The RD54 base disk. I've been having major
problems trying to format them on my RQDX3, I'll post that adventure in
a bit. In a nutshell the drives only partially format then error out. On
Dave G's MFM emulator all the
Chris, what kind of magnet did you use?
If it was an electromagnet I could imagine that you caused physical damage
by something heating up sufficiently. If it was a permanent magnet then it
might indeed be servo data which has been erased. Either way I expect you
need a very strong magnetic field
On Fri, Feb 3, 2023 at 5:21 PM Alexandre Souza
wrote:
>
> I thoug the right one was st512...can you enlighten me on this subject Tony?
I've never heard it called that.
It's often called 'ST506' but that drive had a few differences from
the later ones. it didn't support buffered seeks AFAIK. The
Or ST506 ?
On Fri, Feb 3, 2023 at 5:21 PM Alexandre Souza via cctalk <
cctalk@classiccmp.org> wrote:
> I thoug the right one was st512...can you enlighten me on this subject
> Tony?
>
> Enviado do meu Tele-Movel
>
>
> > I assume by 'MFM' you mean a drive with an interface similar to the
> ST412.
I thoug the right one was st512...can you enlighten me on this subject Tony?
Enviado do meu Tele-Movel
> I assume by 'MFM' you mean a drive with an interface similar to the ST412.
> -tony
>
On Fri, Feb 3, 2023 at 4:57 PM Chris Zach via cctalk
wrote:
> Yep, with 15 yeads it had a servo platter that is gone. Oh well, it's
> securely erased :-) I'll toss the drive, keep the electronics interface
> and keep it in mind for the future.
If you have the tools, it's worth carefully
Embedded servo is rare (unheard-of) on ST412 interfaced drives simply
because the manufacturer has no idea how it will be low-level
formatted and thus where the sector headers will be. So no safe place
for the servo bursts on the data surfaces
*nod* That's what I would think: MFM should allow
On Fri, Feb 3, 2023 at 4:40 PM Chris Zach via cctalk
wrote:
>
> Question: I just used a strong magnet to wipe an old Maxtor MFM drive
> (magnet on outside of case). Now the drive will not even seek properly
> on start up, just endlessly moves the heads..
>
> Is the drive now toast? Do MFM drives
low level format
On Fri, Feb 3, 2023 at 11:40 AM Chris Zach via cctalk
wrote:
> Question: I just used a strong magnet to wipe an old Maxtor MFM drive
> (magnet on outside of case). Now the drive will not even seek properly
> on start up, just endlessly moves the heads..
>
> Is the drive now
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