On Mon, 2006-05-15 at 16:15 -0400, Dario Oliva wrote: > I am trying to use the SG_IO ioctl from the scsi driver to read and > write raw > data to this USB hard drive (IO Data USB HD). I have googled the device > name and > only came up with 13 sites, none of which had any information for this > problem. > This is a link to a reseller in California who sells the device I am using > http://www.devicenet-usa.com/product_en.html#hdp > > To verify that the data was not being written from the device or read > from the device, > I used a protocol analyzer connected to the hard disk While sending the > read or write > commands using SG_IO, there was no activity on the disk. I have also > used a program I wrote > that reads individual sectors from a disk and displays the data in a > format similar to hexdump. > The output from that program is also attached, in the file named data. > As you will see, I did a read > several times from sector 0, receiving different slightly different > values every time. SG_IO seems to be working fine for me on SCSI devices. Could you use sg_dd (on the /dev/sd<x> node) to determine if this may be some problem with your applications usage of SG_IO (i.e. compare the results of an ordinary dd and a sg_dd of the same part of the disc). Thanks, James - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
