choon_min said:hi, everyone.
Do anyone here can suggest where, which book or website can learn more bout the theory behind the magnetic hard disk, and it current technology? i.e. spintronic...
A magnetic hard disk works by using a stack of rotating disks coated with a magnetic material, usually iron oxide. Data is stored on these disks in the form of magnetic fields that represent binary code. The disk also has a read/write head that can read and write data on the disk by changing the magnetic fields. When data is written, the head changes the direction of the magnetic fields to represent 1s and 0s. When data is read, the head detects the direction of the magnetic fields and translates it back into binary code.
The main difference between magnetic and solid-state hard drives is the technology used to store data. Magnetic hard drives use rotating disks and a read/write head to store and retrieve data, while solid-state drives use flash memory chips. This results in differences in speed, durability, and storage capacity. Magnetic hard drives are generally slower and less durable, but have larger storage capacities and are more cost-effective. Solid-state drives are faster and more durable, but have smaller storage capacities and are more expensive.
Data on a magnetic hard disk is organized into tracks, sectors, and clusters. Tracks are concentric circles on the disk where data is stored. Sectors are pie-shaped areas within the tracks that hold a fixed amount of data. Clusters are groups of sectors that hold a larger amount of data. The operating system uses these organizational structures to store and retrieve data efficiently.
The lifespan of a magnetic hard disk can vary depending on usage, but on average, it is around 3-5 years. However, this can be extended with proper care and maintenance. Hard drives are susceptible to physical damage, such as drops or exposure to extreme temperatures, as well as wear and tear from regular use. It is important to regularly back up important data and monitor the health of your hard drive to ensure its longevity.
Magnetic hard drives have undergone significant improvements since their inception in the 1950s. They have become smaller, faster, and have increased storage capacities. One of the major advancements in recent years is the use of perpendicular magnetic recording, which allows for denser storage of data. Additionally, solid-state hybrid drives, which combine the technology of both magnetic and solid-state drives, have emerged as a popular option for faster and more efficient data storage.