External Hard Drive Shows 0 Bytes? Recovery Methods

Use this route if Disk Management or Disk Utility can still see the drive's real physical size, even though its volume reports 0 bytes, RAW, unallocated, or unreadable. Disk Drill can create a byte-to-byte image, scan storage, preview found files, then recover selected data to another device. (disk-drill.com)

1. Install Disk Drill on the computer's internal disk or another healthy drive, never on the damaged external disk.
2. Connect a separate healthy drive with enough free space for the image plus recovered files.
3. Open Disk Drill, choose Byte-to-byte Backup, select the troubled disk, then save the image to the healthy destination.
4. Load the completed image into Disk Drill, select it, then click Search for lost data.
5. Filter the results by file type or date, then preview several important files to check whether they open correctly.
6. Select the files you need, click Recover, then save them to a different physical drive.

Sometimes the disk is readable at the system level, yet its volume has no Windows drive letter or remains unmounted on macOS. This fix is appropriate only when the partition shows its expected size plus a recognized file system.

1. On Windows, right-click Start, open Disk Management, then locate the external disk by capacity.
2. If its partition says Healthy but lacks a letter, right-click it, choose Change Drive Letter and Paths, then assign an unused letter.
3. On a Mac, open Disk Utility, choose View > Show All Devices, then select the existing volume.
4. Click Mount if the button is available.
5. Open the volume, copy critical files elsewhere, then reconnect the drive once to confirm the fix holds.

File-system repair may restore access when directory records or volume metadata are damaged. Run it only after securing the files because repair utilities change the disk's structures, sometimes removing records they cannot reconcile.

1. Confirm that important files have been recovered or copied to a different physical disk.
2. On Windows, open Terminal or Command Prompt as administrator, then run chkdsk X: /f , replacing X with the external drive's letter.
3. On a Mac, open Disk Utility, choose View > Show All Devices, then run First Aid from the lowest volume upward through its container plus device.
4. Let the repair finish without disconnecting the drive or putting the computer to sleep.
5. Reconnect the disk, verify its reported capacity, then open several files from different folders.

Software cannot repair damaged heads, seized motors, burned controller boards, or degraded platters. A lab is the cautious route if the physical disk shows 0 MB, disappears repeatedly, or makes abnormal sounds.

1. Power the drive off, then stop reconnecting it for more tests.
2. Write down what happened before the failure, including drops, power loss, water exposure, unusual noises, or earlier repair attempts.
3. Contact two established recovery labs, then ask whether evaluation is free plus whether charges apply if no useful files are recovered.
4. Ask how the lab handles privacy, return shipping, replacement parts, plus failed recovery attempts.
5. Pack the drive in an antistatic bag with firm padding, then use tracked shipping or local drop-off.