![]() Disconnect the power cable from the hard drive in question.Disconnect the power cord from the computer itself.Boot the computer and listen carefully.If you cannot determine whether the drive is spinning: If you do not hear or feel the hard drive spinning, the drive did not start. If you touch the side of the drive you should feel a slight vibration. Check to see if the hard drive is spinning. ![]() This will stop any power saving commands from being sent. Open the computer case and remove the data cable from the hard drive.To check to see if this is the cause of the BIOS not detecting the hard drive, follow these steps: If the drive is not receiving power or receiving an incorrect level of power, it will not spin up. Black connector - is used for master device connection.Grey (middle) connector - is used for slave devices on the cable.Blue connector - always connects to the motherboard.UDMA cables have colour coded connections which require proper orientation when connecting. For ATA drives, Seagate recommends using UDMA cabling with a maximum length of 18 inches.If the problem persists, then the cable was not the cause of the problem. The easiest way to test a cable is to replace it with another cable.Be sure to check your SATA cables are tightly connected to the SATA port connection. Serial ATA cables, in particular, can sometimes fall out of their connection. The BIOS will not detect a hard disk if the data cable is damaged or the connection is incorrect.Here are some images of Serial ATA cables. For further information, please see Document ID: 182453. For SATA cables, Seagate recommends using cables shorter than 39.37 inches (1 metre).When in doubt of data cable condition, replace it. Folding, crimping, pinching, or creasing data cables can cause the wires to break inside the insulation, leaving the exterior of the cable looking normal. Always inspect the motherboard and hard disk connections for bent or misaligned pins.The warranty is gone anyway so I wouldn't have a problem opening it up.Note: These drivers do not come from Seagate they come from the motherboard manufacturer. Should I open it up? Or is there a way to remove it from the casing and connect it through SATA to recover the data? That's all I'm really worried about at this point. I'm not really sure what's happened, it was working a few weeks ago and is just over a year old. If it helps, the drive appears in devices but not disk management. However, could it also be that there's a problem with the internals? i.e. I understand that this could be due to a power insufficiency linked to the USB cable (can't be a problem with 3 different computer's ports) so I'm going to order a replacement cable and see what that does. I've installed SeaTools for Windows which works normally if the drive is unplugged, but once I plug it in and re-scan the program just becomes unresponsive. The drive is not mounting/spinning up at all, however the LED light remains on all while it is plugged into a computer. ![]() Upon plugging it in via USB it makes a quiet beeping sound (not a clicking sound) for a few seconds, which are usually regular/steady beeps but if I hold the drive sideways or upside down it can sound more like malfunctioned/broken beeping. My Seagate 'Portable Backup Plus' Slim 1TB External Hard Drive is currently not showing up on any computer in my house, which are both Mac and Windows.
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