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HDD Basics
A hard disk drive (HDD) is a data storage device used for storing and retrieving digital information using rapidly rotating discs (platters) coated with magnetic material. An HDD retains its data even when powered off. Data is read in a random-access manner, meaning individual blocks of data can be stored or retrieved in any order rather than sequentially. An HDD consists of one or more rigid (“hard”) rapidly rotating discs (platters) with magnetic heads arranged on a moving actuator arm to read and write data to the surfaces.
- Large Capacities – More and more digital content can be stored
- Ruggedness And reliability
- Capacity per $ – Smaller/Cheaper CE appliances can have HDD
- Higher rotational speed
- High Performance
- Both are Primary storage device
- The difference is in type of Storage Medium.
- HDD has magnetic disk as storage.
- SSD has Memory chips as storage.
Both has a unique position in market as storage device. HDD & SSD will Continue to coexists for Years to come, & both has it own value and market segments.
Today’s hard drive heads typically “fly” at around 100Å above the media For comparison:
- In 1974, the head flying height was equivalent to a Boeing 747 airliner flying at 15 cm above the ground
-In 2004, the 747 has to fly at 0.05 cm - The load on the slider is equivalent to 100,000 passengers
- The speed of the disk under the head is up to 92 km per hour for a 7200 RPM drive
- The head can survive repeated lateral accelerations of 1000 Gs and vertical accelerations of 300 Gs – humans black out at 9 Gs
- The 747 is designed for 30,000 take offs and landings, the head 100,000
