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I would like to test my HDD(read - write -compare) .
For now, current version still uses "ATA_OP_READ_PIO(_EXT)" and it's slow.
If I use "ATA_OP_READ_DMA" instead of "ATA_OP_READ", it will hang up.
I though it must to do something to solve but I have no idea now.
Is it possible to send command using ATA_OP_READ_DMA?
Sorry my poor english.
Although it may be nice to have, I think it may fall outside the scope of this tool. As I understand it, hdparm is for adjusting the various configurable parameters on a HDD and not for data transfer; however, there are the -t -T options.
To do what you want to do you can use dd and md5sum or any other compare utility.