Second, the drive size matches the size of the drive we just installed (around 1 TB), and the drive is flagged as “unallocated”, which means none of the hard drive space has been … If I switch to Legacy mode, the SSD pops up in the list but remains … Edit 2: So tried to go into bios again but got this message about raid config which seems to display the HDD. I had nothing, they weren't just not detected, they simply weren't there. When I reinsert my 2TB Hard Drive, (without turning PC off), I can feel the drive spinning, but it still doesn't show up in My PC or under Disk … The cloning went well, all partitions were cloned from my HDD, including Windows 10. The BIOS finds other hard drives just not this one. In the "MAIN" screen of the bios setup, there are supposed to be 6 SATA ports shown. Once Disk Management loads, scroll down to see if your disk appears in the list. When the external hard drive has an outdated drive driver, it won't show up in File Explorer. It is not the cables as the disk is spinning and data is being transferred through the cable when connecting another Seagate barracuda HDD using the same cables and ports. However, if you purchase a new drive, it should show up in the BIOS. Applies to: Fix external hard drive not showing up and has a yellow exclamation mark in Disk Management. If it does, make sure it's online and formatted. Windows not recognizing new m.2 NVME SSD but shows in BIOS I purchased a crucial nvme m.2 ssd for my MSI GT73 Titan - It shows in the PCIE section of the BIOS but does not show in disk management - Also does not show up in Crucial's Storage Executive Application. If the serial ATA or SATA drivers are not properly installed, hard disk is not enabled in BIOS, hard drive keeps spinning up, or the hard drive is corrupted, failing or dying, BIOS may also fail to recognize your hard disk. After that I plugged the HDD back in and now it doesn't show up in BIOS or in Widows. BIOS will not be able to detect a hard disk when the hard drive data cable is damaged or improperly connected. The drive spins up when the system is booting but than it doesn't spin when in Windows. If it's offline, right-click the disk's name (e.g. If the hard drive does not show up in BIOS, gather as much information about your PC as you can and write it down.Such as the model and manufacturer of the drive, the manufacturer of the computer or motherboard, and the BIOS manufacturer as … Fix 3. That used a new motherboard, cable and power connection. However, when I enter the Bios with F2, the SSD is detected (as HDD0) as well as the original hard drive (as HDD01) but only the HDD appears as a bootable device in UEFI mode. I've now removed my 2TB drive, replaced my SSD with it's "old" Windows installation and my PC boots up as normal. First, the disk is marked as “unknown” and “Not initialized” on the left, which a brand new disk introduced to the system would be flagged as. 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