Can you provide more information regarding the computer? how old, what is the model? do you know what motherboard is in it? what OS are you using or planning on using? 60GB is the smallest you can go but it does not leave much room for anything else. How much space are you currently using on your HDD? If your computer is old is it SATA or PATA? a am going to assume it is SATA if it is SATA 1 150MB you will see improvement but don't expect it to be earth shattering because you are limited to 150MBps. but you will see a difference in tasks requiring many random reads. additionally if you have SATA 1 150MBps or SATA 2 300MBps the speed of the SSD will not matter that much because your SATA interface will be limiting you not the SSD.