From: Norman Diamond ... > By the way, I've seen some USB bridges that lie about whether they > performed various SAT commands (ATA passthrough), but told the truth > about performing an ATA IDENTIFY DEVICE through SAT. So we could attempt > ATA passthrough with an IDENTIFY DEVICE command, and if it happens to > return a sane looking result, we could comparre it to the bridge's own > translation of READ_CAPACITY_10 and READ_CAPACITY_16. If the passthrough > yielded a sane result and the capacity doesn't match, we know not to > trust the bridge with 16-byte commands (except if tested, as mentioned). > In such a case, we don't even have to look at the partition table. Of > course if the ATA passthrough fails or if the result is garbage then > abandon this test and maybe look at the partition table. ... Don't count on devices answering ATA IDENTIFY correctly either. I had some CF cards from one of the main 'labels' that reported an incorrectly layed out identify response, and 2 others (almost identical) that locked solid when the request was issued. We tried to send them back, but they were returned with a nice shiny new MBR table. David -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
