HDD Speed current version I think is V3.3 will shows access time for every sector.. But to map out those sectors you need some program that can work with MFT's to mark them as used or bad or something. Should not be very difficult to do as windows chkdsk will mark a sector as bad or inactive.. Another problem is, every drive have a lot of bad sectors which are remapped and would show as having higher than normal access time as the drive has to go to the spare sector to read those sectors. From the factory those areas of the drive would be marked as bad and unused by the firmware but errors do develop.. Guess it wont matter much if you map out the re-allocated sectors.. But just saying, you can not know if the large access time is because a sector is bad or something else.. Most drives should show under 100 of these sectors as the really bad areas are already mapped out at the factory..