Seagate Archive HDD

[O'Connor, Daniel]

> On 27 Mar 2015, at 10:45, Xin Li <delphij at delphij.net> wrote:
> On 03/26/15 16:55, O'Connor, Daniel wrote:
>> 
>> The drive has many regions with guard bands so it doesn't have to
>> rewrite the entire disk for certain writes (it may have to rewrite
>> a whole band though)
> 
> That really depends on whether we can afford to lose the whole band of
> (meta)data.

I don't think it will lose a whole band, it journals writes, i.e. copies the band to the journal then writes out the whole thing (modified).

> That's is why I am not that optimistic about what we do nowadays, we
> would need to revisit the on-disk formats with the new drives and see
> if adjustments would be necessary.

I agree, but it does look like they have gone to reasonable steps to make it survive power issues.

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
 -- Andrew Tanenbaum
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