Re: Flashbench
On Sat, April 14, 2012 11:38 pm, Bob wrote:
> ...
> # to help you spot where you are in the output 134217728 = 128MB &
> 524288 = 512k; so as the difference halves from ~100µs or more to 55µs
> at 4194304 = 4MB if I'm reading the README correctly this would imply
> that the erase block size on this card is 8MB
>
> One thing I don't understand is, if that is the case, how come the
> original partition started at 4MB
> 8192 * 512 = 4194304
Certainly odd. No insights to offer.
> Irrespective I now start the partition for this SD card at 16384 that
> way, it's allied on a 4MB & an 8MB boundary, ...
I'm using that idea as a temporary arrangement on a CF.
> ... I haven't yet figured out
> what open AUs are and what to do with them, I got slightly disheartened
> when on my OCZ SSD drive it didn't seem to make any difference to speed
> where I started the partition, I need to try again with a CF or SD card,
> maybe it was a buffering thing.
How about AU = allocation unit? No clear idea of
how this relates to the HDD sector or the Flash page.
> That's where I've got so far, not sure I've helped you but my note are
> now a little more ordered.
>
> Let us know how you get on
This also helped.
http://wiki.laptop.org/go/How_to_Damage_a_FLASH_Storage_Device
Will aim to work on it again in late May or in June.
Thanks for the notes, ... Peter E.
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