On Thu, Apr 18, 2019 at 10:24:47PM -0400, Dave McGuire via vcf-midatlantic wrote:
But if we're rewriting the servo tracks anyway, it won't matter, unless we're trying to recreate them to align to existing data. Otherwise they can be anywhere, and the other tracks will follow suit when the drive is low-level formatted.
If its a voice coil servo drive I'm not sure how you would get the track at uniform spacing without some sort of measurement and feedback.
I guess the question is whether we'd do this to recover the functionality of a drive or recover the data from a drive.
I've heard of the degaussing to erase packs problem. I haven't seen bad servo tracks as the reading problem. Is normally some mechanical shift so when the servo has the servo head centered some of the heads aren't on track. Pulling the servo loop method I linked to in the first posting is the easier way to recover the data. I also had tracking problem when I did a board swap to recover a drive. The replacement board servo null was physically off from the original.