What are the categories of hard drives?

Hard drives are divided into three categories: SATA hard drives, SCSI hard drives and SAS hard drives. The SATA interface hard disk is also called a serial port hard disk. It is the mainstream development direction of PCs in the future and has strong error correction capabilities.

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Detailed introduction:

SATA hard drive: Hard drives with SATA interface, also called serial hard drives, are the mainstream development direction of PCs in the future because they have strong error correction capabilities and can automatically correct errors once they are discovered, which greatly improves the security of data transmission. The new SATA uses a differential signaling system "differential-signal-amplified-system".

This system can effectively filter noise from normal signals. The good noise filtering capability allows SATA to operate at low voltage. Compared with Parallel ATA's transmission voltage of up to 5V, SATA only needs to A peak-to-peak voltage of 0.5V (500mv) allows operation at higher speeds. "The more correct term is: peak-to-peak 'differential mode voltage'". The general speed can reach 7200 rpm.

SCSI hard disk: A SCSI hard disk is a hard disk that uses a SCSI interface. Advantages: The SCSI interface has a wide range of applications, multi-tasking, large bandwidth, low CPU usage, and hot-plugging. It is widely used on servers due to its good performance and high stability. Disadvantages: Since SCSI hard drives are very expensive, ordinary PCs will not use SCSI hard drives. The general speed can reach 10,000 rpm.

SAS hard drive: SAS (Serial Attached SCSI) is a new generation of SCSI technology. It is the same as Serial ATA (SATA) hard drive. It uses serial technology to obtain higher transmission speeds. , and improve the internal space by shortening the connecting lines. Improve storage system performance, availability and scalability. The general speed can reach 15,000 rpm or even higher.

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