I am using a Seagate hard drive which makes a strange clicking sound when in use. I searched on internet to find the possible reason for this sound and found that this problem exists in many other hard disks manufactured by Seagate. Also I found that Seagate has released a new patch for the hard disks to solve the problem of the clicking noise. The hard drive that I use has firmware 2SDM1. Now on the website of Seagate, I found that there are two firmwares, Firmware 4SDM1 and Firmware 5SDM1. Now I am confused which firmware I should I upgrade my hard disk with? If anything goes wrong, it might render my hard drive useless for long time. So can anyone tell me which firmware should I install to upgrade my hard drive?