On Mon, 15 Aug 2014 James Bottomley wrote: > So how did the partition get on there at the correct size in the first place? > Even under windows partition managers believe the disk size they get from > the system if the disk is blank. The HDD can be partitioned outside the enclosure, when connected directly to one SATA port on motherboard. READ_CAPACITY(16) will return properly when talking directly to the HDD. > I assume for those of us on linux-scsi who don't have the start of this thread, > you already tried read capacity(16) and it has this same problem? Sorry, I forgot to include linux-scsi. On this device, READ_CAPACITY_16 fails 100% of times as unsupported command, then READ_CAPACITY_10 has a distinct behavior depending on HDD size: 1TB and 2TB: READ_CAPACITY_10 returns correct value 3TB and 4TB: READ_CAPACITY_10 returns in a 2TB modulus > Hm, allowing users to set desired capacity by overriding the partition size ... > I'm sure that's not going to cause support problems ... Well, it is causing problems anyway... from user perspective, it's a Linux compatibility issue, as it works "fine" on Windows. I'm not an expert, but I'm wondering that if usb-storage could set capacity as "UNDETERMINED"/ Zero (or keep using the readcapacity_10 as it as with some flag signalizing it as inaccurate), EFI partition check would be able to ignore size and look for secondary GPT where it really is. []'s Alfredo -- 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
