On Wed, Aug 4, 2010 at 9:51 AM, Jeff Chua <jeff.chua.linux@xxxxxxxxx> wrote: > On Wed, Aug 4, 2010 at 4:31 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> On Tue, 3 Aug 2010, Sarah Sharp wrote: >> What was the exact failure case for fdisk? >> > Would it hang or would it quit with some sort of error message? > > # fdisk /dev/sdb > Unable to open /dev/sdb > >> Neither of these will help. The usbmon log shows that the drive is >> claiming no medium is present. usb-storage debugging will just show >> the same thing, and fdisk won't work. > > Right. That was what I noticed before. linux/drivers/scsi/sd.c > sdkp->media_present = 0. > >> > One thing I noticed is that your device is running in high speed mode. >> > It should have switched over to SuperSpeed mode after it was reset by >> > the USB core. Can you get it to enumerate as SuperSpeed by plugging the >> > device in after an unload/reload of the xHCI driver? >> >> That may be related to the problem. Perhaps the drive gets confused >> when trying to connect at SuperSpeed, and then falls back to high speed >> and stops working. > > I've tried all sorts of things and combinations with unloading/loading > usb_storage and xhci_hcd. > > Is this what you're looking for? It seems to have problem with the > "short transfer" ... Alan, Sarah, I've good news. It's working now. It turned out that the External USB3 SATA enclosure needs more power, but the USB3 port can't supply enough!!! I was using an SSD so can't hear the disk spin and since the disk enclosure works in a normal USB2 port, I thought it's same thing when plugged into an USB3 port. And there's no socket on the enclosure to plug in additional power. ... I had assume that since my USB 2.0 thumb drive works in the USB3 port, the USB3 drive enclosure would work the same. I discovered the problem only when I decided to try out an normal hard disk in place of the SSD. That's when I discovered that when the drive is plugged into to a USB3 port, it won't spin! ... But the same enclosure spins up fine on a USB2 port. Now I'm testing a different disk enclosure with external power and the USB3 host is able to recognize the disk. Hey, disk spins up nicely. I don't the additional extermal +12V to power the drive, but that's all I can get in Singapore now. Thanks for your help! Jeff -- 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
