Wait for the scan to finish. If Windows finds file system errors, it will repair them and restore your missing space. 2. Format the Drive via Disk Management
The File Allocation Table (FAT32 or exFAT) has been damaged. Windows reads gibberish and assumes the remaining space is zero.
A device dropping to "Full Speed" instead of "High Speed" can indicate: usb mass storage devicenand usb2disk full
What is the and brand of the USB drive?
Pulling a USB2Disk drive without using "Safely Remove Hardware" corrupts the translation layer (FTL) that maps logical blocks to physical NAND pages. Corruption here often manifests as a "disk full" error. Wait for the scan to finish
If H2testw confirms that your 64 GB or 128 GB drive is actually a spoofed 8 GB chip, you have two choices:
When you see in Device Manager, that’s just the generic Windows driver for any USB drive, external hard disk, or memory card reader. It’s not a brand name—it means the driver is working. Format the Drive via Disk Management The File
This fixes logical errors without necessarily deleting your data. 7 Data Recovery Experts chkdsk E: /f in the Command Prompt (replace with your drive letter). Disk Utility , select the drive, and click 7 Data Recovery Experts 3. Perform a "Clean" Reset (Data will be lost)
These repairs usually result in total data loss. If the data on the drive is critical, consult a professional recovery service before attempting to "clean" or "flash" the device.
Before attempting these steps, from the USB drive to your computer if possible. 1. Reformat the USB Drive to NTFS or exFAT
This article covers everything about NAND USB2DISK devices: how they work, why they appear the way they do, and how to fix common problems.