How do I low level format a hard drive?

Discussion in 'OT Technology' started by Swerve, Jan 13, 2006.

  1. Swerve

    Swerve OT Supporter

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    Hi,

    I need to low level format a hard drive and I can't do it the way I did ages ago (through BIOS).

    How is it done these days? I need to do one.

    Thanks.:bowdown: :)
     
  2. DAN513

    DAN513 OT Supporter

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    the IBM drive fitness test (DFT) has a low level format utility in it, and it works on all the drives I've tried it on, samsung, toshiba and WD.
     
  3. Swerve

    Swerve OT Supporter

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    Thanks, where do i get that?
     
  4. galek_spoo

    galek_spoo New Member

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  5. Zak8022

    Zak8022 New Member

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    maybe i'm being a noob, but what is a low level format as compared to just a normal format?
     
  6. grkgus

    grkgus New Member

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    Low-Level Formatting
    Low-level formatting is the process of outlining the positions of the tracks and sectors on the hard disk, and writing the control structures that define where the tracks and sectors are. This is often called a "true" formatting operation, because it really creates the physical format that defines where the data is stored on the disk. The first time that a low-level format ("LLF") is performed on a hard disk, the disk's platters start out empty. That's the last time the platters will be empty for the life of the drive. If an LLF is done on a disk with data on it already, the data is permanently erased (save heroic data recovery measures which are sometimes possible).
    If you've explored other areas of this material describing hard disks, you have learned that modern hard disks are much more precisely designed and built, and much more complicated than older disks. Older disks had the same number of sectors per track, and did not use dedicated controllers. It was necessary for the external controller to do the low-level format, and quite easy to describe the geometry of the drive to the controller so it could do the LLF. Newer disks use many complex internal structures, including zoned bit recording to put more sectors on the outer tracks than the inner ones, and embedded servo data to control the head actuator. They also transparently map out bad sectors. Due to this complexity, all modern hard disks are low-level formatted at the factory for the life of the drive. There's no way for the PC to do an LLF on a modern IDE/ATA or SCSI hard disk, and there's no reason to try to do so.
    Older drives needed to be re-low-level-formatted occasionally because of the thermal expansion problems associated with using stepper motor actuators. Over time, the tracks on the platters would move relative to where the heads expected them to be, and errors would result. These could be corrected by doing a low-level format, rewriting the tracks in the new positions that the stepper motor moved the heads to. This is totally unnecessary with modern voice-coil-actuated hard disks.
    [​IMG]Warning: You should never attempt to do a low-level format on an IDE/ATA or SCSI hard disk. Do not try to use BIOS-based low-level formatting tools on these newer drives. It's unlikely that you will damage anything if you try to do this (since the drive controller is programmed to ignore any such LLF attempts), but at best you will be wasting your time. A modern disk can usually be restored to "like-new" condition by using a zero-fill utility.
     
  7. Zak8022

    Zak8022 New Member

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    Wow... thanks. At least i feel ok that i have never heard of this before... cuz it isnt something that sounds like its been needed in the time that i've been in/around computers.

    So, given the accuracy of the above post, it sounds like you wouldnt even need to do a LLF. That is, unless you have a drive of significant age.
     
  8. EvilSS

    EvilSS New Member

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    You can't low level format an IDE or newer SCSI drive unless you happen to be the manufacturer and have a hard drive factory in your closet. The days of MFM and RLL are loooong gone. It's no longer necessary anyway since the tracks don't drift anymore.
     

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