Re: NAND flash misery

David Brown schreef:
Didi wrote:
Dombo wrote:
Didi schreef:
Vladimir Vassilevsky wrote:
...

I was under impression that flash is more reliable then HDD; now I see
that it is not so. Do you know how reliable are the IDE flash drives?

Vladimir,
if flash were a viable and reliable replacement for HDDs this would
have
happened for years by now, the costs would have gone down. They are
not, and given their limited number of write cycles they are bound to
stay out of the way of normal disks (which have achieved an amazing
level of performance).
When the platter densities of (mechanical) HDD's went up at a certain
point manufactures of HDD's had to resort to error correction schemes to
obtain reliable operation. A modern HDD would be unusable without ECC.
It appears that high density flash is going the same direction.

True, but HDDs don't wear out with writing - and flash does.
This is a major advantage flash does not promise to catch up
with - at least for the time being.

HDDs wear out through use. The lifetime is roughly dependant on the time the hard disk has been powered up, and how much the head is moved. It's thus fairly independent of the size.

Also the number of spin-ups of ordinary HDD's is only guaranteed to about 50.000 cycles. This can be a limiting factor when one needs to employ aggressive power saving strategies.

.

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