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Reading that Wikipedia article... I'm surprised SpinRite is still around. It is my understanding that modern magnetic media really hides what's going on at the
by ansible 8y ago
Reading that Wikipedia article... I'm surprised SpinRite is still around.
It is my understanding that modern magnetic media really hides what's going on at the platter level. This is not like the old days with MFM or RLL hard drives (before IDE). It is my understanding the modern disk controllers maintain their own mappings, and can in fact remap bad sectors on their own. I didn't think any of this information was available at the operating system level to the extent that it can be usefully modified outside the drive's own logic.
- londons_explore 8y agoModern drives do a bit of remapping, but still keep a near 1:1 mapping of physical to logical sectors. It surprises me, because the drive has much more knowledge of typical access patterns combined with the hardware characteristics, so could easily do things like store two copies of some data so that whichever is closest to the read head can be read. I guess manufacturers just aren't interested in speed optimizations anymore now that SSD's exist.