HD Speed is a great tester for read and write speeds, works on all drives it seems and easily finds usb. 
You can save the test file, etc... and while it seems like a basic tester, it's very thorough and does the job it was made for. I tested my 4 gig USB which when writing to, seems to slow down at certain points or even stall. This picked it up in the read-write and shows where the drops are and gives me a good indication that there are bad spots on this stick, time for a new one. 
They now added a box to type and verify before you write to a drive as it will erase data, this was an extremely good move on their part and I now give it 4 stars.
																							
																						       	
																								 Review details
																								
																								 
																									- Interface  
- Features  
- Ease of use  
- Value  
- Recommend to a friend? Yes
- Posted Jul 24, 2012 for v1.7.5.100