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[Discuss] NAS: lots of bays vs. lots of boxes

On Fri, Jul 10, 2015 at 5:41 PM, Rich Braun <richb at> wrote:
> As drive capacities increased, transfer speed also did. (You have updated your motherboards to 6G SATA, right?) I posted here not too long ago that I'd suffered a triple-disk failure, which forced me to buy into the current crop of magnetic media rather than wait & see what the SSD market looks like in 2017.

There is a big difference between the bus speed and the actual speed
that data can be read from/written to a disk.   Hard drive
manufacturers love to talk about the bus speed; but for something like
a RAID rebuild, the sustained transfer speed is what matters.   And
that hasn't been going up that much.   I think even the best
enterprise hard drives max out at less than 150Mbytes/second and most
drives are well under 100.   That's one way in which SSDs are better.
They can actually make use of the faster bus speeds.

Bill Bogstad

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