DYK | computer hard disk
When is the last time you took appart a traditional HDD - hard disk drive?
I recently took appart a modern SATA drive, and to my suprise...
Hard disk drive platters have undergone changes over time. Let’s explore the materials used for these platters and when this transition occurred.
Traditional Platter Materials:
Historically, hard disk drive platters were made from aluminum alloy or a mixture of glass and ceramic.
These materials provided the necessary rigidity for the platters and allowed them to withstand the mechanical stress caused by spinning motion.
Magnetic Coating:
The surface of each platter is coated with a thin layer of magnetic material (usually a type of iron oxide).
This magnetic coating allows data to be stored magnetically on the platters.
Transition to Perpendicular Recording:
Around 2005–2006, a significant shift in hard disk drive technology occurred.
Originally, hard drives used in-plane magnetized materials to store data (bits).
However, this approach was replaced by a technique called perpendicular recording.
In perpendicular recording, the magnetic regions are oriented vertically (perpendicular to the platter surface) rather than horizontally (in-plane).
This change allowed for higher data storage densities and improved overall performance.
Materials Today:
Glass and aluminum alloy are still commonly used for hard disk drive platters.
Glass platters are often favored for laptop computers, while aluminum alloy platters are prevalent in desktop computers.
Both materials provide strength, lightweight properties, and resistance to temperature fluctuations and corrosion.
In summary, the transition from in-plane magnetized materials to perpendicular recording marked a significant advancement in hard disk drive technology. While the materials remain similar (glass or aluminum alloy), the way data is stored has evolved to achieve higher storage densities.
#SCRM #HDD #DBAN #datarecovery
