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  1. #1
    Super Moderator BATcher's Avatar
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    It was never necessary to bother much about this when we had smaller disks, but suppose this was a 1 TB (well, 1 TiB!) hard disk?

    I'd be interested in any comments on the following:

    "The time taken to format a 1 TB drive to NTFS will depend to a large extent on the slower of:

    * data transfer speed between PC and external hard disk (USB2 speed)
    * how fast the hard disk can write data

    Assuming we have to write 1 TB of data to format the 1 TB disk (bad assumption, but bear with me!)...
    USB2 speed is 480 Mbps = 60 MBps, so for 1 TB that's 1,000,000/60 seconds which is about 11½ days. That should be the worst case, assuming the disk can write data as fast as it is presented by the USB2 interface. It would be easy to find the maximum rate at which data can be written to a specific hard disk, and compare it with the nominal USB maximum data rate."

    I've never actually measured how much data has to be written to a hard disk to format it, but I would presume it is less than the figures I calculate above! Any thoughts, folks?
    BATcher

    Mr Owl ate my metal worm

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  3. #2
    Plutonium Lounger
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    [quote name='BATcher' post='794899' date='25-Sep-2009 10:56'][/quote]
    I can't provide any numbers because I didn't keep track of my events. When I bought these two 500 gig USB hard drives and CONVERTED them from FAT32 to NTFS, it DID take a very long time. But, it was hours not days, so I don't know what would happen with a true format or a 1 TB drive.

  4. #3
    Super Moderator BATcher's Avatar
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    [quote name='Bigaldoc' post='794950' date='25-Sep-2009 21:28']I can't provide any numbers because I didn't keep track of my events. When I bought these two 500 gig USB hard drives and CONVERTED them from FAT32 to NTFS, it DID take a very long time. But, it was hours not days, so I don't know what would happen with a true format or a 1 TB drive.[/quote]
    The user reports that it took between 12 and 19 hours (sleep intervened, so no accurate result possible!) to format the 1 TB drive on the laptop to which it was connected via a USB port.
    BATcher

    Mr Owl ate my metal worm

  5. #4
    Uranium Lounger
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    I can add that I have image backups that I've made to external HDs that took several hours (8-10 or more, but I never timed it so I can't say for certain) to create and takes the same several hours to restore. The largest drive I have imaged is 300 GB.

    For my primary backup, I installed a matching 300 GB drive as a slave inside the case and create a full image of the 300 GB, 2 partition drive after copying off the previous image to an external drive and formatting the drive to NTFS to remove the old image and give myself a "clean" drive to create the new image. Tedious, I know, but it makes me feel better about my backup's integrity (even if they are out of date ). But backing up to and restoring from the internal drive only takes about 30 minutes to restore the 125 GB image of the C drive and perhaps 1.5 hours to restore the entire 300 GB drive image.

    Hope this is of some use.
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    4 Star Lounger
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    [quote name='BATcher' post='795022' date='26-Sep-2009 09:34']The user reports that it took between 12 and 19 hours (sleep intervened, so no accurate result possible!) to format the 1 TB drive on the laptop to which it was connected via a USB port.[/quote]

    Saw your post and decide to FINALLY get off my keester.

    I have a 1TB external drive I FINALLY attached to a Compaq D51U SFF (2Ghz Processor, 2GB Memory, XP Pro) via USB 2. Before starting an NTFS format, I disconnected the internet and shut down any startup program I did not need.

    Fair test - probably not. Set clock on computer and started the format. Was able to be there close to when it stopped.

    Time .... approx 10 hours and 20 minutes.

    Correct spelling errors
    Scott

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