11 Feb
2021
11 Feb
'21
10:03 a.m.
On Thu, Feb 11, 2021 at 9:45 AM Nigel Johnson via cctalk <
cctalk at classiccmp.org> wrote:
On 2021-02-11 12:41 p.m., Al Kossow via cctalk wrote:
Al's right in this case. In addition to the controller almost certainly
using a different low-level format than whatever your friend's disk was
written with, you're doubly screwed because you're using an MSCP controller
-- the Sigma's going to expect RCT and FCT blocks somewhere on the unit for
block remapping and since they're not there (and are in fact likely
unreadable due to the difference in low-level format) it will fail.
- Josh
On 2/11/21 9:33 AM, Nigel Johnson via cctalk
wrote:
Doesn't stop me trying, Al. Lots of things were achieved by people who
didn't know they couldn't do it!
My controller has settings for different sector sizes. I owe it to my
friend to try!
I'm about to try the very same thing.
I have a MicroVAX II with a sigma MSCP ESDI controller. It can be set
for soft-secoring or various numbers of hard sectors. That is what I
see is the big issue with these drives.
A friend gave me two drives that had been written on a PC under *nix.
There is little chance this will work for the same reason you can't use
an arbitrary disk/controller combination for PC recovery.
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591 nw.johnson at ieee.org