Boundary for Successful USB Drive Data Recovery
The chip quality is stable up to 32GB, but the cost to manufacture chips above 64GB with the same quality significantly increases. Selling it at retail price dissuades customers from purchasing. Therefore, the manufactures lower the quality of the chip to sell it for a cheaper price. Recovering data from these lower quality chips has a low success rate.
The boundary for successful data recovery is between 32GB and 64GB. It is mostly successful to recover from a 32GB USB Drive, but the chip failure rate increases above 64GB.
Unrecoverable Cases
Case 1
If the USB Drive is heavily damaged and the chip is visible, it is impossible to recover data. Ex. A dog chewed on it, and the chip portion is visible.
Broken Chip