Lukasz Jaroszewski schrieb:
2009/1/26 Hans Petter Selasky <[email protected]>:
On Monday 26 January 2009, Lukasz Jaroszewski wrote:
Hi,
after opening /dev/ad4 with success for O_RDWR, I am getting [EINVAL]
from write(2), which according to man 2 write, means
`` [EINVAL] The pointer associated with d was
negative.'', as you can see below it is not true, I have tried
different block sizes, with same result.
How can I write one byte to /dev/adN ?
Hi,
You cannot write one byte to /dev/adN, I think. Harddisks are block based.
Please see:
diskinfo -v ad4
And especially the "sector size". When you seek and transfer data the offset
and length must be a factor of the "sector size" or "block size". See also
LBA, logical block address.
Yes, I have tried with bs=512 and multiplies, no luck.
r...@~(0) diskinfo -v ad4
ad4
512 # sectorsize
2029805568 # mediasize in bytes (1.9G)
3964464 # mediasize in sectors
3933 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.
ad:CFx20CARDx200000190C # Disk ident.
It would be helpful, if you showed the actual code, instead of letting
us guess what you are doing.
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