> -----Original Message----- > From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb- > owner@xxxxxxxxxxxxxxx] On Behalf Of Jeff Chua > Sent: 04 August 2010 15:28 > To: Alan Stern > Cc: Sarah Sharp; Linux USB; gregkh@xxxxxxx > Subject: Re: usb3.0 not recognizing hard disk. > > 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. > Most PCIe USB3 add-in cards have a power connector, which isn't usually necessarily unless you run juicy bus-powered devices. If your USB2 port is on the mainboard, and your usb3 port is an add-in card, try hooking up that power connector to the PSU. Hope that helps Andy -- 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
