I need some help please with some hard drive issues.\n\n\nI have been running a Synology DS211 Network Attached Storage unit with 2x 2TB internal Hitachi 3.5inch HDDs (RAID 1 = identical mirrored drives)\n\nLast week it started making some funny noises, and became inaccessible. I suspected HD failure in one or more drives.\n\nI ran Synology diagnostics on the NAS itself without the HDDs and that was all fine - so [B]definitely not a NAS hardware problem.\n[/B]\nI then bought a SATA to USB3 cable to hook up the drives to a Windows computer in order to run the Hitachi WinDFT (Drive Fitness Test) which is their HD diagnostic tool.\n\nNow, when I connect the first drive to the computer via SATA to USB3, and plug in the power, it is making a funny noise (therefore the problem lies with this drive). However:\n- Whilst the computer recognises a new piece of hardware being connected, it cannot "install new hardware" and fails at this stage\n-I can't seem to find it in My Computer/My Devices and WinDFT doesn't scan for it and recognise that it is connected.\n\n\nThe "good" drive when connected spins normally. The computer recognises a new piece of hardware has been connected, and seems to install drivers successfully. Windows recognises that a "mass storage device" is connected (when I look for it in "My Devices"). However:\n- It does not appear in My Computer as an extra drive\n- When I go to disk management, it shows up (in addition to my C:/ drive (OS) and E:/ drive (data partition) - but it has [B]no drive letter assigned, has no information available[/B] (ie. total capacity, capacity filled etc)\n- It tells me that in order to use the disk, I need to "[B]initialize[/B]" it. But doing so will erase my data (and this is the only disk with my data on it!)\n- When I then scan for drives using Hitachi's WinDFT - it cannot even detect that the good drive has been connected.\n\nI'm not 100% sure, but I think Synology automatically format their drives in EXT format (I think).\n\n\nWhat do I do next? How do I get the drive recognised in Windows?