Re: Raw device access

On a sunny day (Fri, 12 Dec 2008 08:55:16 -0800 (PST)) it happened
"superhac007@xxxxxxxxx" <superhac007@xxxxxxxxx> wrote in
<e131897a-1fa6-41e6-b38b-3c4962259bec@xxxxxxxxxxxxxxxxxxxxxxxxxxx>:

Essentially that's what I did. I moved 446 bytes from the start of
the disk to the partition table. Since theres only 1 partition on my
flash drive I just needed the first partition's LBA_START (+8) field.
Then I took value which is stored there (first sector of partition1)
and multiplied by 512(all modern drives have 512 byte sectors)

Some of the newer high capacity SD cards have 1024 bit sectors or 'blocks',
or even bigger.
This starts at > 2GB I think.
http://www.hjreggel.net/cardspeed/special-sd.html

Only interesting if you are writing a driver for those perhaps, and
also when you consider the limited r/w cycles of FLASH memory,
as writing 4 x a 512 byte sector to a card with a block size of 2048
uses up 4 x the writes, compared to writing 2048 bits at the time.

This right?


.

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