HI On 08/22/18 12:51, Andreas Krey wrote:
It's a bit gentler to pick it up and 'flick' it arond the disk axle. At least that's how I got a disk startet I bought (used) at the flea market many years ago.
I was to write that: I have resurrected old 5.25 SCSI hard disks that way, with much less scenic than slamming it on the floor. If it sticks, it is best to power it (old disk had separate power and often a jumper to have it start without the need for a BUS command) and when it tries to start (you hear a faint repeating soud) you give it with the hand a rotation and often it starts! "Stiction" is different: very old disk did not retract heads and they could stick on the surface, that... is bad
However, I recently had my MacBook not powering on.. a slight bump and a retry made the hard disk start... so not that the new stuff is immune to this. However, laptops are carried around to temperatures or even inside plane, stuff you would not have done with your old 5.25 "bricks"
To the original poster: SCSI disk had indeed strange incompatibilities with termination (and termination power) and even just cables. I used to have lots of them on the stuff I love to run NetBSD on.. and some combinations "just did not work" even if they should. So trying another computer... or just trying another connector/terminator sometimes helps.
Riccardo