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Date:      Mon, 31 Jul 2017 11:49:52 -0400
From:      "James B. Byrne" <>
To:        "Polytropon" <>
Subject:   Re: Unable to mount USB Flash memory created on CentOS
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <> <>

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Lest it be lost in the minutiae of solving this difficulty I thank you
for all your help.

On Sat, July 29, 2017 05:01, Polytropon wrote:
> I'd suggest you use the Linux native fsck (e2fsck). If I
> remember correctly, there is also an "ext2 fsck" in the
> port e2fsprogs with the same name.
> Or maybe it came with FUSE?
> Basically, you'd so something like
> 	# fsck -t ext2 /dev/da1
> or, as I mentioned,
> 	# e2fsck /dev/da1
> An automatic file system type detection relies on an entry
> in /etc/fstab, which you don't have, so you need to specify
> the FS type manually.

When I try to verify the flash drives I see this:

# e2fsck /dev/da1
e2fsck 1.43.4 (31-Jan-2017)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/da1
. . .

So I redid the command using the partition values instead:

# e2fsck /dev/da0s1
e2fsck 1.43.4 (31-Jan-2017)
CA_HLL_2016_BKUP has gone 267 days without being checked, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Error writing file system info: Invalid argument


However, the device remains unmountable in Mate.

This issue is not critical as I am able to manually mount both devices
and have successfully moved their contents onto new media.  But I do
find it annoying that Mate, or whatever process caused the initial
problem, was able to create the problem and yet there is no
self-evident way of correcting whatever injury was done to the

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James B. Byrne      
Harte & Lyne Limited
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

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