Chris Csanady wrote:
On 6/1/07, Frank Cusack <[EMAIL PROTECTED]> wrote:
On June 1, 2007 9:44:23 AM -0700 Richard Elling <[EMAIL PROTECTED]>
wrote:
[...]
> Semiconductor memories are accessed in parallel. Spinning disks are
> accessed
> serially. Let's take a look at a few examples and see what this looks
> like...
>
> Disk iops bw atime MTBF UER
> endurance
>
-------------------------------------------------------------------------
> ---------
> SanDisk 32 GByte 2.5" SATA 7,450 67 0.11 2,000,000
10^-20 ?
> SiliconSystems 8 GByte CF 500 8 2 4,000,000 10^-14
> >2,000,000
...
these are probably different technologies though? if cf cards aren't
generally fast, then the sata device isn't a cf card just with a
different form factor. or is the CF interface the limiting factor?
also, isn't CF write very slow (relative to read)? if so, you should
really show read vs write iops.
Most vendors don't list this, for obvious reasons. SanDisk is honest
enough to do so though, and the number is spectacularly bad: 15.
For the SanDisk 32 GByte 2.5" SATA, write bandwidth is 47 MBytes/s -- quite
respectable.
For the SiliconSystems 8 GByte CF, write bandwidth is 6 MBytes/s -- not so
good.
-- richard
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