You can use the program to run a variety of tests on flash drives either as logical or physical drives, the former to access a drive on the partition level and the latter to access the entire drive irrespective of partitions or formatting information. The tests include a read stability test (to see if all data can be read without cyclic redundancy checking (CRC) errors), a write-and-read test, a low-level format test, saving or loading a disk image to the drive, and a full erase. Tests can be run once, forever, x number of times or until an error surfaces. The program's licensing is unclear -- I could not find any documentation about it -- but it's probably free for personal use.
No registry entries and AFAICT no folder writes
http://mikelab.kiev.ua/index_en.php?pag ... chkflsh_en
(I'm not confident enough to officially submit things yet
)