Mydisktest V2.42 [2021]

You have a "fake" drive. The software found that after a certain point (e.g., 16GB), the data disappeared or became corrupted, proving the 1TB label is a lie. The Technical Side: How "Expansion" Works

[e.g., Data is at high risk of corruption once the physical capacity limit is reached. It is recommended to stop using the device for critical storage immediately.] Important Security Note Mydisktest V2.42

This was the era of the "expanded" or "fake" flash drive, and became the essential tool for the digital skeptic. The Illusion of Capacity You have a "fake" drive

MyDiskTest V2.42 is a legacy Windows-based utility designed for testing removable storage devices (USB flash drives, SD cards) and fixed hard disks. Its primary notoriety stems from its ability to detect "fake" or "counterfeit" flash memory—drives that report a higher storage capacity to the operating system than they physically possess. It is recommended to stop using the device

: The program will explicitly flag that the drive has been altered or expanded. It will detail exactly how many megabytes (MB) or gigabytes (GB) are physical, and how much of the drive is completely fake storage space. What to Do If Your Drive Fails the Test

[e.g., Meets USB 2.0 specifications / Significantly below advertised V30/U3 speed class] 4. Summary & Recommendation