Re: fedora-list Digest, Vol 12, Issue 335

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Thanks!Its a great relief to know there isnt a HDD problem.Actually im
paranoid bcoz despite of vendor's warnings i formatted hdd twice to
install fedora.(installation of fc3 needs u to format the drive :((
Thanks for ur support.
Rajev


---------- Forwarded message ----------
From: Robert Nichols <rnichols42@xxxxxxxxxxx>
To: fedora-list@xxxxxxxxxx
Date: Mon, 21 Feb 2005 10:50:24 -0600
Subject: Re: 'Some Contents Unreadable" error still exists after checking HDD
Rajev Mhasawade wrote:
> Hi,
> I did use shutdown now -Fr command and it checked filesystem after
> reboot without detecting any errors and stating all drives are
> 'non-contagious'.Yet when i try to find out space used by each
> drive(via right click),information displayed there does not match with
> that of df -h.And the error (some contents cannot be read) is still
> there.
> What does this mean,is my HDD problematic?What should i do?Plz help!

The responses you are reporting do not mean that anything is wrong
with your disk drive.  The "some contents cannot be read" message
simply means that the program is not running with root permissions
and has encountered some directories that it does not have permission
to access.

The disk usage calculated by walking through the file system directory
tree will often not be an exact match for what is reported by 'df'.
There are several reasons for this:

 1. Files that have been unlinked ('rm'ed) from the directory tree
    still occupy space on the disk but cannot be seen for the usage
    summary.

 2. Files that are open for writing will have some data blocks
    pre-allocated.  A program that sums file sizes (st_size in the
    inodes) won't see these blocks, but they are still considered
    "used" by 'df'.  A program that sums block counts (st_blocks
    in the inodes) will see these pe-allocated blocks.

 3. Files with more data blocks than can be listed in the inode
    need additional "indirect" blocks that contain lists of block
    numbers.  As above, these blocks are included in st_blocks but
    not in st_size, so a program that sums file sizes won't see them.

 4. Files with multiple hard links need to be treated specially.
    Programs that walk the directory tree commonly add (size/N),
    where N is the number of hard links, to the usage total each
    time a multiply-linked file is encountered.  Because of integer
    truncation, N*(size/N) may not equal the actual size.

--
Bob Nichols         rnichols42@xxxxxxxxxxx


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