1. 1T refers to 1TB mechanical hard disk, which is a traditional ordinary hard disk, and mainly consists of: disk, magnetic head, disk spindle and control motor, magnetic head controller, data converter, interface, cache, etc.
All disks in the mechanical hard disk are installed on a rotating shaft, and each disk is parallel. There is a magnetic head on the storage surface of each disk, and the distance between the magnetic head and the disk is smaller than the diameter of the hair. All magnetic heads are connected to a head controller, which is responsible for the movement of each head. The magnetic head can move along the radial direction of the disk, and the disk rotates at a high speed of several thousand revolutions per minute, so the magnetic head can be positioned at the designated position of the disk to read and write data.
Hard disk is a precision equipment, and dust is its enemy, so it must be completely sealed.
2. 128G refers to 128G solid-state hard disk, solid-state disk or solid-state drive, also called electronic hard disk or solid-state electronic disk, which is a hard disk composed of a control unit and a solid-state storage unit (DRAM or FLASH chip).
The interface specification, definition, function and usage of solid state hard disk are the same as those of mechanical hard disk, and the product shape and size are also the same as those of mechanical hard disk. Because SSD has no rotating medium of mechanical hard disk, it has excellent earthquake resistance. The working temperature range of the chip is very wide (-40~85 degrees Celsius). At present, it is widely used in military, vehicle, industrial control, video monitoring, network monitoring, network terminals, electric power, medical care, aviation, navigation equipment and other fields. At present, due to the high cost, it is gradually spreading to DIY market.
There are two kinds of storage media for "data expansion" SSD, one is flash memory and the other is DRAM.
IDE flash drive (serial ATA flash drive): Flash chips are used as storage media, which is what we usually call SSD. Its appearance can be made into various shapes, such as notebook hard disk, micro hard disk, memory card, U disk and so on. The biggest advantage of this SSD is that it can be moved, data protection is not controlled by power supply, and it can adapt to various environments, but its service life is not high and it is suitable for individual users.