HP Hewlett-Packard delivers high quality and resilient hard drives that fully support and assimilate across the enterprise Hewlett-Packard storage and server's class line. Before the IDE (Integrated Drive Electronics) hard drives, hard drive controller was used to interface the hard drives to the motherboard of PC. The basic servo and electronic functions along with the mechanical stuff was performed by the hard drive. The details were managed by the controller. Most of the firmware and the electronics were moved from the controller to develop the IDE hard disk drive.



Cache memory was used in IDE hard drive so that the writing & reading process could be speed up. So the hard drives became smarter with high level of performance. IDE drive was interfaced to motherboard bus with IDE controller. IDE controller is a bus interface and has connector and interface for the integrated drive electronics cable that goes to the hard disk. The hard drive has the actual controller. More often when the hard drive controller has problem, the actual problem lies with in the hard drive's electronics. Afterwards, drive cable's connector and IDE-controller extension board electronics were added in most of the motherboards. These motherboards mostly have 2 IDE interfaces. One interface is the primary while other is the secondary interface. Each of these IDE interfaces can support 2 devices of IDE.

For the improvement and incorporation of other devices to the IDE hard drive, many standards were developed afterwards like CD-ROM that can work off the integrated drive electronics interfaces (Ultra ATA, ATA Packet Interface, and enhanced IDE). The hard drives use the ?direct memory access? and ?bus mastering? for back & forth transferring of data between computer memory and IDE hard disk. The transfer speed reaches up to 66MB/s without moving through processor.

HP delivers high quality and resilient hard drives that fully support and assimilate across the enterprise HP storage and server's class line. Hard drive basically comprises of spindle, motor, platters, frame, electronics, air filter, actuator and read/write heads. Mechanical parts are mounted by frame and cover seals the hard drive. HAD (hard disc assembly) is the hard drive's sealed part. Drive electronics comprise of printed circuit boards (mostly one or more) which are mounted on HDA bottom. The platter and head of the hard drive are very much similar to the old phonograph's playback & recording head. The difference is that the data structure of CD-ROM and phonograph record is arranged in spiral while the arrangement of hard drive's data structure is in concentric circles. There are one or more platters in hard disk drive and usually there are heads on each side of the platters.

In modern hard disk drives the platters are mostly made from ceramic or glass. The older hard drives had aluminium platters that had thermal attributes which were unfavorable. Therefore to prevent these unfavorable characteristics, ceramic and glass platters were introduced in the new hard drives. On the platters surface is deposited layer of magnetic material. That is why the surface of platter is shining and chrome like. The drive motor of the hard disk turns the spindle on which platters are mounted. The revolution per minute of most of the IDE hard drives are 5400, 7200, 10000 or 15000 and still are emerging.

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