Re: Large hard disk confusion

From: Brian Clark (brianj+devnull_at_unwell.org)
Date: 02/07/05

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    Date: Sun, 6 Feb 2005 18:15:02 -0500
To: debian-user@lists.debian.org

    On Sun, Feb 06, 2005 at 08:24:25AM -0600, Ron Johnson wrote:

    > On Sun, 2005-02-06 at 10:44 +0100, Marcus Lundblad wrote:

    > > On Sun, 6 Feb 2005, Brian Clark wrote:

    > > > I just installed sarge on a 160 GB hard disk. Partitions are 2GB swap,
    > > > 50 MB /boot, and the rest for /.

    > > > ~$ df -ahT
    > > > Filesystem Type Size Used Avail Use% Mounted on
    > > > /dev/hda3 ext3 145G 230M 138G 1% /
    > > > proc proc 0 0 0 - /proc
    > > > devpts devpts 0 0 0 - /dev/pts
    > > > tmpfs tmpfs 443M 0 443M 0% /dev/shm
    > > > /dev/hda1 ext3 45M 9.3M 33M 23% /boot
    > > > usbfs usbfs 0 0 0 - /proc/bus/usb

    > > > My question is, why is hda3 only showing as 145 GB? Surely ext3 isn't
    > > > taking up gigabytes worth of journal information?

    > > I think it's common that "160 GB" means 160000000000 bytes when
    > > manufactures defines harddrive space.
    > > And 160 "real" GB is 201997680640

    > 160 GiB = 171,798,691,840
    > 160 GB = 160,000,000,000

    > If OP would read the fine print on his hard drive, he would see
    > that the manufacturer clearly specifies that GB == 1,000,000,000,
    > i.e. 10^9, *not* 2^30.

    Thank you very much, Ron et al.

    Now that I understand that, which was embarrassing, I might as well
    embarrass myself further.

    It seems like I'm still missing some space somehow.

    $ df -a --block-size=1000
    Filesystem Type 1kB-blocks Used Available Use% Mounted on
    /dev/hda3 ext3 155510408 262910 147347940 1% /
    proc proc 0 0 0 - /proc
    devpts devpts 0 0 0 - /dev/pts
    tmpfs tmpfs 463561 0 463561 0% /dev/shm
    /dev/hda1 ext3 46214 9659 34089 23% /boot
    usbfs usbfs 0 0 0 - /proc/bus/usb

    $ swapon -s
    Filename Type Size Used Priority
    /dev/hda2 partition 1951888 0 -1

    proc isn't stored on the hard disk IIRC, and tmpfs is in memory, right?

    (155510408 + 46214 + 1951888) * 1000 = 157,508,510,000

    Where's the other 2,491,490,000? 

    -- 
Brian Clark
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