Emsa DiskCheck - Disk checking and benchmarking tool - scans CD/DVD/HDD etc. Freeware.

Emsa DiskCheck 1.0.57 Description

You can use it to do a full check of the surface of any disks, for example if you have just scratched a disk and want to see if it is still readable, or if you want to check all your cd library for time or usage related faults. You can also use it for drive benchmarking, easily comparing speeds through 'X' speed multiplier factor, in real conditions. You can also scan hard drives or even floppies - and get real condition performance information accordingly with drive performance but also with the way data is stored on it, which obviously impacts on overall performance. Make sur you clean the CD or DVD before doing tests, to remove dirt and ensure tests are accurate. Freeware.