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 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 useless with a
magnet if yours has a servo surface. (This is not the same as embedded servo,
which places servo information -with- the data on the same surfaces.)
