I tried to remove the files in Windows and I could remove most part of them, but not all (I couldn't remove all, but some of them were moved from .Trash-100 to RECICLED.BIN. The another weird thing is that it removed 33.2 TB of files... The chkdsk also removed some sync.ffs_lock weird files that couldn't be remove.

I run the chkdsk D: /f and it made a lot of corrections althoug the strange files are still there and cannot be removed, same behavior as before. In output said that were no erros in disk too. Tried badblocks /dev/sdc but got ...invalid end block (4883770583): must be 32-bit value.

Yes, I tried withoud -d scsi and it returned /dev/sdc: Unknown USB bridge [0x0bc2:0xab28 (0x100)]

Tried: sudo smartctl -a -d scsi /dev/sdc and got SMART Health Status: OK, smart support is available but disabled. When I tried to run the short or long test I got [unsupported field in scsi command]. The drive is ok then?

Thanks for your answer! I guess I can't run SMART in an external hard drive over USB (can I?), in gnome-disks the SMART option for this drive is unavailable. dmesg shows almost nothing when I tried to remove that files, but when I disconnect the drive the only error I got are this one: ``` [147487.632078] sd 6:0:0:0: [sdc] Synchronize Cache(10) failed: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK ``` Should I try chkdsk? It is a very weird problem, difficult to guess if is a hardware or filesystem problem.