I have used it several times in the past to backup Windows 7 & 10, but now I can use it to backup Win 7 only not Win 10! I believe this problem may have started after I performed a quick format on it using a Win 10 machine, and also ran CHKDSK /R in order to mark the bad sectors. Turn off Time Machine in System Preferences > Time Machine and use Disk Utility to run First Aid on the Time Machine backup drive. When pressing the 'eject' button Finder warns me with the message: 'The volume can't be ejected because it's currently in use. Smo) If ejecting or unmounting the backup drive doesn't fix the problem, the Time Machine volume may have disk errors that need to be repaired. To unmount the volume, start by accessing the disk utility. 5% of volume size for MFT and does not allow writing there any user's data, which lets MFT to grow. You cannot use a volume that is included in the backup as a storage location. This volume cannot be used because it is a backup disk If the volume that cannot be recognized by Windows is on external HDD, memory card or USB flash drive, you need to connect it to computer and make sure it can be detected properly.
