Computer Hardware - Hard
hard disk
effect
It is an important computer storage devices, responsible for persistent data
classification
By type: mechanical hard disk (physical drive) solid state drive (electric drive)
By interface :: IDE, scsi, sata, sas (latter two mainstream)
speed
SSD
There sata solid, m.2 solid, pci-e three kinds of solid
The fastest SSD disk theory tells nvme.m2 read and write speed of 3400MB / S
Mechanical hard drive
Mechanical hard disk platters by the member, a head, a motor, a circuit board or the like, divided into two kinds of 2.5 and 3.5, the rotation speed of 5400 rev / min, 7200 / min, 10 000 rpm / min, 15,000 rev / min. Notebook with the 2.5-inch, 3.5-inch desktop common
Undoubtedly the fastest mechanical hard 15,000 rev / min scsi disk interfaces, the theoretical read 220MB / S
Purchase index
Reference Index: capacity, cache, read speed
capacity
The ability to store data
Cache
The data in the cache can speed up data read and write efficiency
Read and write speed
Hard disk read and write speed
Hard Fault
Mechanical hard disk is a consumable device, if there was dust inside the disk can cause data corruption and other issues.
SSD is a storage life of the particles, frequent reading and writing data, such data is not suitable for the present solid state (operating system can be installed in this hard disk)
server
Security server value for money and data (data recoverability)
General use mechanical hard disk