I have two laptops, a Dell XPS running 64-bit and HP Pavilion 32-bit and I want to replace the Dell hard drive with the hard drive in the HP temporarily because my Dell laptop became very slow and I want to test if the problem is with the hard drive or something else. The question is: Can I do that without losing data in the two hard drives? I know that maybe data on C partitions will be deleted and that's OK, but will the rest of the data will be lost or not?
Why don't you plug the disk to the other laptop externally and try to copy files to and from it. To see the speed of copy operation. This will not harm your disks.
There's a far easier way to get better information about the health of your hard drive.
Download HD tune, check the SMART status, run speed tests and post here if you don't understand the results. www.hdtune.com
Problem Solved . It was the hard drive, it has delay. Dell diagnostics didn't show the hard drive delay. A technician have made a delay test with a software and it came up with a delay error in the hard drive. Software called HDD Regenerator.
I replaced it with a new one and the problem totally solved. No lags or freezing anymore. I just wanted to share my experience if anyone have this problem, this post may help.