- Apr 24, 2011
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No I meant when they are breaking down, why do they get especially hot? Not from general useMotors, electricity, environment.
No I meant when they are breaking down, why do they get especially hot? Not from general use
when a sector goes marginal or bad, the hdd moves the block to somewhere else. when the whole hdd is full of bad sectors, it just thrashes to no end. Thus the heat.
Possibly friction is involved due to bearings getting worn. I have never experienced it.
Chicken + egg thing?Is the dying causing the overheating? Or is the overheating causing the dying.
Is the dying causing the overheating? Or is the overheating causing the dying.
That may be well and good for the drive and performance as the OS / filesystem-level fragmentation goes, but that shouldn't have any bearing on re-allocation of sectors on a HDD. HDDs actually come with a certain percentage of "spare area", that is NOT host-accessible, that they use for sector-sparing. When that area is used up, the drive DOES NOT start using up host-accessible sectors as spares, it simply starts to error.When a drive gets so full that reallocation becomes difficult, bad things happen. That's why I always leave 30% free.
It's not "scheduled" at all. It simply waits until there is a host write to that particular logical sector, then it writes to the "spare sector", and updates the re-mapping table, stored in the firmware / SMART / remapping table sectors in a hidden area (not normally host-accessible, without diagnostic-level commands) at the beginning of the drive.Unfortunately I haven't been able to find a good article that describes how the process or reallocation tends to be scheduled though. I
When a drive gets so full that reallocation becomes difficult, bad things happen. That's why I always leave 30% free.
It's not "scheduled" at all. It simply waits until there is a host write to that particular logical sector, then it writes to the "spare sector", and updates the re-mapping table, stored in the firmware / SMART / remapping table sectors in a hidden area (not normally host-accessible, without diagnostic-level commands) at the beginning of the drive.
Sure it is. The error is detected on a read, but it's not safe to replace that host-accessable sector, until the host writes to it. Pretty straightforward.Surely if it was done pretty much immediately then a 'pending sectors' attribute wouldn't be required?
Sure it is. The error is detected on a read, but it's not safe to replace that host-accessable sector, until the host writes to it. Pretty straightforward.
My hard drive has 2 sectors that the drive recognizes as bad, but that cannot be reallocated yet. If you were to attempt to read one of these ‘Pending sectors’, the drive would likely retry (and retry, and retry), and eventually return a read error to the host operating system as shown below:-
Did you read the winning answer? It's completely correct, and thorough.
It doesn't remap on reads, normally. It usually just errors, and hangs the drive for a while (unless it's a TLER drive). It remaps on writes.
I think that you're misunderstanding here.