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"Incorrect function" error when running Windows on a Mac

When using RAM Disk with Windows running on a Mac computer via Boot Camp, the "incorrect function" error is likely to be caused by a driver that Apple installs on Windows. This driver doesn't seem to work well with standalone volumes, i.e. disks without partitions. The same problem affects other applications that create similar standalone volumes, such as TrueCrypt and VeraCrypt.

This issue can be fixed by either:

  • Removing or disabling AppleHFS.sys. This will also make it impossible to access HFS+ volumes from Windows; or
  • Enabling Hard Disk Emulation in the RAM Disk. A complete hard drive will be emulated in this case. The downside of this option is that it is a little slower.

Article details

Article ID: 43

Category: RAM Disk: technical questions and how-to

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