There are several different types of drive failure. There's the obvious one, where your drive stops working entirely. Perhaps your computer doesn't even recognize it when it starts up and you see a message saying your PC has no hard drive, or perhaps your computer begins booting and just can't get through the boot process.
Any sort of clicking noise from a mechanical drive is a bad sign. This indicates the head, which reads and writes the data from the platters on the drive, has failed. It's best to shut down the drive completely to avoid further damage and use a professional data recovery service if you need your data back. You won't hear any strange noises from a solid-state drive, as they have no moving parts.
A hard drive is the hardware component that stores all of your digital content. Your documents, pictures, music, videos, programs, application preferences, and operating system represent digital content stored on a hard drive. So to answer your question, your OS is contained in your HDD.
Size of HDD depends on your requirements. A 120 GB hard disk drive will be okay. If you simply need to transfer a limited number of files between a computer and a backup drive, a smaller drive (
Expansion Drive or
Backup Plus ) will work. If you want to back up your entire computer or several computers - or if you store a lot of video and/or audio - you'll want a larger drive
You can check with an expert about how to get your hard disk replaced
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