MIB.42 has released MSTest which is a Memory Stick benchmark utility for the PSP.
Heres the info from the coder:
I just got my new SanDisk 2GB MemoryStick Pro ( the light blue one ) and run the R/W tests. Read speed is same as the 512M one ( 14.3 MB/s ), but the write speed dropped a bit compared to the 512M ( 4.3MB/s vs. 5.2MB/s ), but this should be fine and still pretty good...
I also cleaned up the memorystick test program which I attach. Can be interesting to run it on those HDD devices...
Assigned buttons :
X - HELP screen
SELECT - Clear Screen
Up/Down - Change test data size
Shoulder - Test data size +- 1KB
Left/Right - Test data size +- 128KB
Square/Circle - Test data size +- 8MB
Triangle - Change the number of R/W tests
START - Start the tests
During Test :
Square - Cancel Write Test
Triangle - Cancel Read Test