Diskferry

Mac external drive not showing up on Windows: fixes

A drive that worked on a Mac shows nothing in File Explorer on Windows. Usually that is expected: Windows does not give drive letters to APFS or Mac OS Extended partitions it cannot read. The question is whether Windows sees the hardware at all.

1. Check Disk Management

Right-click Start and choose Disk Management. Look for a disk with the size of your drive.

  • The disk is listed, with partitions but no drive letter or no file system Windows recognizes: the hardware is fine and the drive is Mac formatted. Go to step 3.
  • The disk is not listed: Windows does not see the hardware. No app can read it until it does. Go to step 2.

Do not create, delete, format or initialize anything in Disk Management. If it offers to initialize the disk, choose Cancel.

2. If Windows does not see the disk

  • Plug it directly into the PC, not a hub or a keyboard port.
  • Try another cable and another USB port. Bus-powered hard drives often need more power than a long or thin cable carries.
  • Drives with their own power supply need it switched on.
  • If the drive clicks, grinds or keeps spinning up and down, stop: it is failing hardware. A recovery service is the safe option.

3. Open the Mac drive

Once Disk Management lists the disk, an app that reads Mac formats can open it. In Diskferry, click Find Mac drives, allow the Windows prompt and wait a few seconds for slow drives to spin up; click again if the drive was still connecting. It opens disks with a Mac partition read only and shows each volume.

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When Diskferry cannot open it either

  • The internal SSD of a Mac with a T2 or Apple silicon chip is not supported.
  • Fusion Drives (an SSD and a hard drive combined) are not supported.
  • Drives formatted on a Mac as exFAT or FAT are not Mac formats: Windows opens them directly. If one does not open, the problem is the drive or its file system, not the Mac.

Still stuck? Support explains what to send us, including the log from Details.

Questions

Can I just assign a drive letter in Disk Management?

A letter does not help: Windows still cannot read the Mac file system behind it, and opening it leads to the format prompt. Leave the partitions as they are.

The drive shows in Disk Management but Diskferry finds nothing. Why?

Diskferry only opens disks that carry an APFS or Mac OS Extended partition. A drive formatted exFAT, FAT or NTFS is not a Mac drive, and a reformatted drive no longer has its Mac volume. Write to support with the log from Details and we will look.

Last updated 30 October 2026. Still stuck? Support replies in person.

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