I am using a desktop PC at home and hearing particular noise from hard disk while shutting down the PC. Is it a sign of any danger? If yes then please suggest some solution to this problem. Thanks in advance.
I get a similar sort of noise on my PATA hard drive which makes a loud click sound when it's about to turn off (it makes it because its turning the spin disk off), I wouldn't worry to much about it.. but backup your data just incase your HDD is on the verge of dying.
It's most likely the head parking. But either way you should always have backups anyway. HDDs can fail any time and often without warning.
Just my two cents, the other guys already made the best suggestions. If the life of your hard drives are shorter then normal it's a sign of power issues. Either the PSU is under powered, defective, bad connector, bad amp distribution on the rails. If this is not an isolated incident take a hard look at the power supply.
As they have said, a clicking noise or other noises coming from the hard drive CAN be the sound of impending doom, a.k.a. hard drive failure. Make sure all of your files are backed up occasionally and check your power supply to make sure it is giving out the right amount of voltage to the hard drive. You can check your BIOS to see the current voltages.
A clicking noise is probably just heavy read/write access as its writing files when shutting down, or it could just be the drive being switched off by the OS and stopping, making a clicking noise as the head stops.
Hard Drives are very inexpensive items, especially when compared to the value of the data that is stored on them. When they go wrong, it can really hit the fan. Why risk leaving a questionable drive in service for the sake of less than $100?
there are some hard drive tools available that can run tests, like manually park the head, read/write test i cant remember the name of the one i tried but it was probably on a boot cd like one of these, Hiren's boot CD, Ultimate Boot CD, The Universal Bootdisk.v1.4.Deluxe-DeepWateriSO these bootdisks have some excellent tools on them for all kinds of stuff, google them up and take a look at the hdd tools