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What's a HDD - Basic Description Of A Mechanical Hard Drive

The Basics of Hard Drives

A hard disk drive is a computer device that allows data to be stored permanently. A hard drive (HDD), stores data even when it is powered down making it non-volatile, an example of volatile memory would be RAM which does lose data when it is powered down.

Parts Of The Hard Disk Drive

  • ​​​​Read/write head(s) - Just as the name suggests the heads are the physical part of the disk that writes data to the platter surface, reads the data already written to the platters or deletes the data on the platters.
  • Actuator arm - The actuator arm is the part of the disk which holds the read write heads.
  • Case/chassis - The chassis is the metal casing which contains all the internal parts of the disk as well and holding the external circuit board.
  • Spindle - For mechanical hard disks the spindle holds the platters and allows them to spin at high speed.
  • Platter(s) - The platters are the disks contained within the hard disk normally made using aluminium or in some cases glass that contains a ferrous surface which holds magnetic charge which is how the data is stored on them.
  • Circuit board - A printed circuit board which contains chips and other electronic components which control the hard drive as well as the interface that connects it to a computer.

How Do They Save Data?

Data is written to a hard disk in the form if a magnetic signal in the surface of the platters, platters are broken down to specific areas.

How Does It Connect To The Computer?

Hard drives connect to a computer using a bus through an interface most often IDE or SATA although there are other interfaces such as SCSI and Fibre Channel.

R3 Data Recovery is real lab that deals with real disasters each an every day. If you have any sort of problem with a hard drive or any data storage device, we are the people to contact. Call us today on 0800 999 3282 for immediate help and assistance.

Posted In: Hard Drive | Q&A

What Our Customers Say About Us

R3 Data Recovery, from first enquiry phone-call with Will to returning my fully recovered HD data by courier, they were impeccable. They were really faultless. They recovered my data sooner than arranged, they kept me informed and updated at every stage. There was no hard sell, no nasty surprises, they told me the prices upfront and sent emails to confirm this. They honoured the original quoted price. They were just a joy to work with! I was so impressed!! I’ve already recommended them to a friend who has a damaged SD card.

I’m an extremely happy & relieved bunny right now. R3 Data solved a problem Apple was arbitrarily charging me around £2000 to sort and the high street recovery shops were clueless about. One high street data recovery shop claimed they could fix my hard-drive, kept it for 3 days, didn’t fix it then still charged me £105 to get my laptop back.

Seriously!! Try R3 data. I mean, they even send a courier to pick up you HD from where-ever you are.

Danny T

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​If your hard drive happens to fail, contact our team of experts. Our skilled professionals will be able to reliably recover data on your hard drive and provide industry-leading turnaround times which give you the confidence that's necessary to develop a solid, effective recovery plan.


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