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Thread: External USB 2.0/3.0 HDD max size.

  1. #1

    Question External USB 2.0/3.0 HDD max size.

    Hello,

    From what I read on this website, for a Suse 12.3 32 bits, the max size for a hard drive is 16 TB, it doesn't specify which file format. I plan to buy a Western Digital external HDD, either the model 'MyBook' or 'Elements', there are both 3TB and 4 TB models, they are formatted for WXp in NTFS which means I'll have to re-format the drive in EXT4 and probably leave a small partition of 300GB in NTFS for whatever need arises.

    So I like to ask your experience with these external HDD drives and if I'm right about the size Suse 12.3 is capable of using. On the forums here, I only found some questions about Suse not recognizing the HDD some times.

    OS Linux 3.7.10-1.16 OpenSuse 12.3 (Darthmouth) (i586)
    KDE 4.10.5 'release 1'

    Processor: P4 2.8 Ghz
    RAM: 2 GB

    Thank you

  2. #2
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    Default Re: External USB 2.0/3.0 HDD max size.

    On 2013-12-13 17:26, mhunt0 wrote:
    >
    > Hello,
    >
    > From what I read on this website, for a Suse 12.3 32 bits, the max size
    > for a hard drive is 16 TB, it doesn't specify which file format.


    Which website? Please give a link to the page that says that.


    > So I like to ask your experience with these external HDD drives and if
    > I'm right about the size Suse 12.3 is capable of using. On the forums
    > here, I only found some questions about Suse not recognizing the HDD
    > some times.


    I'm not aware of any size limit - except the 3 TiB for MBR. You have to
    format as GPT.

    Notice that: 3 TiB ≠ 3 TB

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 12.3 x86_64 "Dartmouth" at Telcontar)

  3. #3

    Default Re: External USB 2.0/3.0 HDD max size.

    Oops... it reads TiB.. not TB.. my bad, it was read here:

    https://www.suse.com/documentation/s...esystems_major

    so, there are no limits on the HDD USB ? even in a 32bit system

  4. #4
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    Default Re: External USB 2.0/3.0 HDD max size.

    On 2013-12-13 22:56, mhunt0 wrote:
    >
    > Oops... it reads TiB.. not TB.. my bad, it was read here:
    >
    > http://tinyurl.com/ks44t9m


    (Notice that is a SLES docu, while this here is openSUSE. Not the same
    thing).

    What paragraph?

    For instance, I read:

    +++····························
    1.4 Large File Support

    Originally, Linux supported a maximum file size of 2 GiB (231 bytes).
    Unless a file system comes with large file support, the maximum file
    size on a 32-bit system is 2 GiB.
    ····························++-

    Which is not true, as I have a 32 bit machines by my side which I use to
    download DVDs over 4 GiB.

    I remember the LFS support was something important several years ago, we
    talked a lot about that at the time.


    And I see no reference to USB storage in the whole page.


    > so, there are no limits on the HDD USB ? even in a 32bit system


    There are limits, but I don't see where exactly you read that, so I can
    not comment on them.

    There is a limit on 2 TiB if you use traditional partitions. As 2TB is
    less that 2 TIB, a 2 TB disk unit has no problems.



    Maybe you refer to this:


    +++····························
    IMPORTANT:Table 1-3 describes the limitations regarding the on-disk
    format. The Linux kernel imposes its own limits on the size of files and
    file systems handled by it. These are as follows:

    File Size

    On 32-bit systems, files cannot exceed 2 TiB (2⁴¹ bytes).
    File System Size

    File systems can be up to 2⁷³ bytes in size. However, this limit is
    still out of reach for the currently available hardware.
    ····························++-

    The 2 TiB limit is the limit on a single FILE, not on the disk.


    Or maybe you refer to table 1-4? There is a 16 TiB limit there, "per
    block device" on 32 bit arch. Well, that is way over 3 TiB, so no
    problem for you.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 12.3 x86_64 "Dartmouth" at Telcontar)

  5. #5

    Default Re: External USB 2.0/3.0 HDD max size.

    yep, my mistake, sorry, I'll get the HDD next year since I always avoid this end-of-year craziness.

    I was referring to the max hdd capacity (not file size), since, for example, my PC can only handle internal PCI hard drives of 120 GB, but since USB devices are suppose to be different but wanted to make sure before investing in a 3TB hdd.

    thank you

  6. #6
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    Default Re: External USB 2.0/3.0 HDD max size.

    On 2013-12-14 00:16, mhunt0 wrote:
    >
    > yep, my mistake, sorry, I'll get the HDD next year since I always avoid
    > this end-of-year craziness.
    >
    > I was referring to the max hdd capacity (not file size), since, for
    > example, my PC can only handle internal PCI hard drives of 120 GB, but
    > since USB devices are suppose to be different but wanted to make sure
    > before investing in a 3TB hdd.


    PCI drives? I'm not sure about that, but on IDE/pATA/sATA that doesn't
    mean a thing for Linux. The problem is booting, after that Linux handles it.

    I have old computers which came with 2 gigs hard disks on which I put
    disks of hundreds of gigs, absolutely not supported by the board bios.

    The only thing that is needed is that all the pins are connected, Linux
    does not use the BIOS for accessing them.



    --
    Cheers / Saludos,

    Carlos E. R.
    (from 12.3 x86_64 "Dartmouth" at Telcontar)

  7. #7

    Default Re: External USB 2.0/3.0 HDD max size.

    thanks! that's a relief, I guess I'll know more when I buy the thing next year

  8. #8
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    Default Re: External USB 2.0/3.0 HDD max size.

    On 2013-12-14 05:36, mhunt0 wrote:
    >
    > thanks! that's a relief, I guess I'll know more when I buy the thing
    > next year


    I have some old notes about hard disk limits, taken from a Seagate paper:

    2.11GB or 4095 cylinder limitation
    3.26GB or 6322 cylinder limitation
    4.22GB or 8192 cylinder limitation
    8.45GB (7.8 GiB) Standard INT13 limitation (CHS[1024x256x63]x512)
    33.8GB (31.5 GiB) or 66,060,287 LBAs limitation
    137.4GB (128 GiB) or 268,435,455 LBAs limitation (28-bit limit)

    Your 120 limit you mention is perhaps the 128 GiB limit above. At this
    moment I don't remember if that was a BIOS problem or hardware problem.
    Your computer must be ancient if it is affected by that one.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 12.3 x86_64 "Dartmouth" at Telcontar)

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    Default Re: External USB 2.0/3.0 HDD max size.

    Quote Originally Posted by mhunt0 View Post
    Oops... it reads TiB.. not TB.. my bad, it was read here:

    https://www.suse.com/documentation/s...esystems_major

    so, there are no limits on the HDD USB ? even in a 32bit system
    I am reading that linked document as showing the file system size limit to be 16 EiB, not 16TiB. And an EiB seems to be around a million TiB, if I am reading that correctly.
    openSUSE Leap 15.3; KDE Plasma 5.18.6;

  10. #10
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    Default Re: External USB 2.0/3.0 HDD max size.

    On 2013-12-14 15:26, nrickert wrote:

    > I am reading that linked document as showing the file system size limit
    > to be 16 EiB, not 16TiB. And an EiB seems to be around a million TiB,
    > if I am reading that correctly.


    Table 1-4, probably.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 12.3 x86_64 "Dartmouth" at Telcontar)

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