At least once every 6 months.
You don't want to clean your hard drive as you risk damaging it. Dust won't hurt it under normal use.
You should NEVER unplug your hard drive with your computer still powered on. It will destroy the drive.
maybe RAID
Do a Defrag. and a Disc clean-up
reformat the computer.
Your hard drive will be more prone to be broken. Reformatting hard drive needs not to be very often. Hard drive is reformatted once there is no more chances of recovering it from corrupted files, virus, bad sectors, etc. When you format your hard drive, you will certainly feel that your computer is slowing down due to the hard drive being read uncomfortable for the system and later on your hard drive will be broken.
of course. its a disk cleaner that helps delete unused data and makes more space in your hard drive.
hard drive head crash
You should only touch the outside of a hard drive. The parts of the hard drive you should not touch are inside. The hard drive is sealed and if you break the seal, you void any warranties and risk any data you have inside.
Changes are that it's a fan and not the hard drive. However, if it is the hard drive, chances that the internal bearings are going bad. I'd replace the drive and transfer the contents as soon as possible, before the drive completely crashes.
In order to completely wipe a hard drive on a Canon branded copier, one must format the hard drive. Formatting the hard drive will erase all information. The operating system of the copier can then be re-installed.
completely wipes a hard drive clean