Discussion in 'Computer Information' started by kvg.ktk@gmail.com, Aug 28, 2008.

  1. Guest

    what is SATA harddrive?
    What is PATA harddrive?
    what is the deffernece between these harddrive (IDE, SATA, and PATA)?
    which drive is the best?
    , Aug 28, 2008
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  2. Paul Guest

    > what is SATA harddrive?
    > What is PATA harddrive?
    > what is the deffernece between these harddrive (IDE, SATA, and PATA)?
    > which drive is the best?

    Look at your motherboard first.

    Do you see a ribbon cable like one on this page ?


    If so, that is an example of IDE or Parallel ATA or PATA. Names for the
    same thing.

    The IDE ribbon cable has room for two drives, a master and slave drive.
    Each drive in the picture here, is using a different jumper setting.
    That is how the drives know which is master, and which is slave.



    If you motherboard has a smaller connector, with seven contacts
    on it, that is SATA or Serial ATA. There is a picture here
    of some motherboard connectors for SATA.


    This picture shows the data cable and power cable, connecting to
    the back of a SATA hard drive. Your power supply might need a
    SATA power cable, in order to power the drive. You can buy
    adapters, consisting of a Molex 1x4 on one end of the adapter
    cable, with the SATA power connector on the other end.


    Molex to SATA power adapter cable.


    A SATA cable, takes only one drive on the end. In the BIOS, it
    might say "master" and "slave" next to the SATA drives, but this
    is an artificial BIOS distinction. The drive itself has no jumper
    that sets any master or slave mode. The SATA drive does have room
    for a couple jumpers, but at least one of the jumpers is only used,
    to force the cable on the drive to run at the slower of two data
    transfer rates. That jumper is typically used, when connecting a
    new SATA drive, to a VIA chipset with SATA ports.


    So you should buy a disk, to match what your motherboard can
    support. Alternately, you can buy an add-in controller card,
    which could also be used to control a PATA or a SATA disk.
    But the choices there, are a bit tricky. It is best, if you
    can use a motherboard connector for your new disk.

    In terms of speed, there is a 300GB Velociraptor SATA disk, costing
    about $300, from Western Digital. It has a SATA interface, and
    transfers data at a sustained 120MB/sec rate. As with other
    hard drives, as you get further from the beginning area of the
    disk, the transfer rate drops.

    Regular IDE or SATA drives generally rotate at 7200RPM. The
    Velociraptor (or the other members of the Raptor family) rotate
    at 10,000 RPM. The higher RPM speed helps reduce the seek time (as
    average rotational latency is 1/2 the time to spin one

    The best drive, one with a SCSI interface, is the Cheetah 15K.5.
    The platter spins at 15,000 RPM. The sustained transfer rate is
    135MB/sec. You would need an add-in controller for your computer
    in order to use it, and for the average current generation
    desktop, you'd want a PCI Express version of controller card.
    Otherwise, the PCI bus would be a bottleneck, and restrict the
    transfer rate. A PCI Express x1 slot could probably handle
    200MB/sec without a problem. The additional cost of SCSI
    drives, prevents SCSI from being a practical alternative
    for desktop users. And some of the older SCSI drives are
    noisy, and the noise would drive you nuts. By comparison,
    some of the cheap desktop drives, are quiet and provide the
    additional storage you need.

    You can see more benchmarks here.


    Paul, Aug 29, 2008
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