Au87101a Ufdisk May 2026

To understand the problem, we must first decode the name.

In simple terms: When you see "AU87101A UFDISK," your computer recognizes that a USB storage device is plugged in, but the drive has "forgotten" its name and proper configuration due to firmware corruption.

The standard workflow for using ufdisk with an AU87101A controller involves: au87101a ufdisk

If the Mass Production Tool is too intimidating or the drive still shows the correct capacity (e.g., 32GB), you might simply have a partition table error, not dead firmware.

Q: Is AU87101A UFDISK a virus? A: No. It is a symptom of firmware failure. However, a virus can cause the corruption that leads to this error. To understand the problem, we must first decode the name

Q: I ran the MPTool and now the drive is even smaller (e.g., 32GB became 8GB). Why? A: The MPTool detected bad blocks on your NAND chip and "blocked them out." Your drive's usable cells have degraded. It is time to buy a new drive.

Q: Can I fix this on a Mac? A: MacOS will also show the drive as unidentified. Use Disk Utility -> First Aid. If that fails, you must use a Windows PC for the MPTool, as MacOS does not support these low-level USB flashing utilities. In simple terms: When you see "AU87101A UFDISK,"

Q: Does this work for SD cards? A: No, "AU87101A UFDISK" specifically refers to USB flash drives. SD cards have different controllers (though they can also show generic errors like "Generic Storage Device").

If the drive still shows a controller string like AU87101A, you need to identify the actual controller chip to reflash it. This is the most advanced step and may erase all data.

Warning: This will permanently erase all data on the drive. Only do this if the drive contains no important files.

Before we attempt to fix the firmware, you must get your data back. You have three options: