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Solve : Could not detect mobile HDD? |
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Answer» When I plug in ANY mobile HDD into my USB port, the system could not detect its existence. The power LED of the mobile HDD is lit. The system does not prompt me for new hardware detection, neither could I find it in My Computer. Is it brand new ? ?Yeah, that's where I'm headed Gotcha...Allan, it didn't show up in the disk management. Patio, I've tested three different HDD of different brands and models, all works fine on the owner's machine but none works on mine. They are not brand new but all are below one-year-old.Please forgive a silly question, but you are connecting the drives to a power source, correct?A mobile HDD get the power from the USB port, isn't it? It only has one cable which is the USB cable, and doesn't have a separate power cable.... Like these: Okay. Everyone's terminology is different. External hd's use AC power and I couldn't be certain what you were describing. The newer external HDDs that are in 2.5" (laptop drive) format will typically be USB bus-powered. If the drive is not being detected, and all other USB devices work in all other ports on the PC, then either: a) The drive has a double USB "A" connection (like the middle screenshot you provided). One of the connections is for data and the other is for power. If only one is plugged in, then the drive won't be detected at all. b) The drive has a single USB "A" connection that is for both power and data (like the first and last screenshots). However, these types of drives/enclosures will only work in a USB 2.0 port. If you're PLUGGING it into a USB port that doesn't support 2.0, the drive won't be detected. c) Certain brand-name PCs may have lower-powered USB ports that don't support the full 500 mA... d) The drive inside the enclosure is not fully connected to its IDE/SATA interface. e) The drive is kaput... F) The enclosure is kaput... g) Both e and f.Quote from: Allan on December 15, 2009, 01:15:53 PM Okay. Everyone's terminology is different. External hd's use AC power and I couldn't be certain what you were describing.External HDD typically refers to a normal HDD housed in a external casing which connects to the USB and uses a separate power supply. Mobile HDD typically refers to laptop type HDD that works like a removable flash drive. That's what I understand.Quote from: killerb255 on December 15, 2009, 01:32:04 PM a) The drive has a double USB "A" connection (like the middle screenshot you provided). One of the connections is for data and the other is for power. If only one is plugged in, then the drive won't be detected at all.You've eliminated all but b)... ...however... I just remembered something else: h) The motherboard shares its entire bus and power between all the USB ports. i) The power supply is "just" powerful enough to run everything on the PC...nothing more. I remember dealing with h) with a previous build of my own. Particularly, I had an MSI P6N-SLI FI motherboard. I tried connecting my Windows Mobile phone to every USB port--results ranged from nada to seeing the phone and failing to install the drivers. I bought a PCI card with additional USB ports on it. The phone worked fine when connected to it. When that happened, I checked Device Manager and found that there were 3-4 USB controller buses assigned to that one card, but only one controller bus assigned to the six onboard ports! Although you haven't addressed b) yet (USB 2.0 or no USB 2.0?), EXPLORE h) and i) as well... |
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