what is hard disk
A hard disk drive is a main data storage hardware device in a computer.it a non-volatile memory hardware device that store data permanently.the operating system,software,other computer files are stored in a harddisk.A hard disk drive is a secondary storage device
types of computer hard disk
hard disk are four types
parallel advanced technology attachment(PATA)
serial ATA (SATA)
small computer system interface (SCSI)
solid state drives (SSD)
parallel advanced technology attachment(PATA)
pata hard disk drives also known as Integrated Drive Electronic (IDE) and Enhanced Integratedd drive electronic(EIDE).The labels relate to the type of interface that is employed to connect the disk drive to the CPU board. These drives utilize either a 40 or an 80 wire cable with a broad 40-pin connector. 40 wire cables are utilized in older and slower hard disks, whereas 80 wire cables are used in faster ones.
nowdays,SATA hard disk drive replace PATA.EIDE hard drives were introduced after some advancements in IDE hard disks, however, the term IDE refers to both IDE and EIDE disk drives.
serial advanced technology attachment(SATA)
It is an interface used to connect ATA hard drives to a computer's motherboard. SATA transfer rates start at 150MBps, which is significantly faster than even the fastest 100MBps ATA/100 drives.the SATA interface has several advantages over the PATA interface. For one, SATA drives each have their own independent bus, so there is no competition for bandwidth like there is with Parallel ATA. They also use smaller, thinner cables, which allows for better airflow inside the computer. SATA cables can be as long as one meter, while PATA cables max out at 40cm. This gives manufacturers more liberty when designing the internal layout of their computers. Finally, Serial ATA uses only 7 conductors, while Parallel ATA uses 40. This means there is less likely to be electromagnetic interference with SATA devices.
small computer system interface (SCSI)
Stands for "Small Computer System Interface," and is pronounced "scuzzy." SCSI is a computer interface used primarily for high-speed hard drives. This is because SCSI can support faster data transfer rates than the commonly used IDE storage interface. SCSI also supports daisy-chaining devices, which means several SCSI hard drives can be connected to single a SCSI interface, with little to no decrease in performance.
solid state drives (SSD)
An SSD (solid-state drive) is a type of nonvolatile storage media that stores persistent data on solid-state flash memory. Two key components make up an SSD: a flash controller and NAND flash memory chips. The architectural configuration of the SSD controller is optimized to deliver high read and write performance for both sequential and random data requests. SSDs are sometimes referred to as flash drives or solid-state disks.
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