[CentOS] cannot access file: Input/output error

Tue May 9 21:37:22 UTC 2017
John R Pierce <pierce at hogranch.com>

On 5/9/2017 2:24 PM, Styma, Robert (Nokia - US/Phoenix) wrote:
> You mention this is a USB drive.  Input/output error means something is wrong.  Possibly seriously.
> The blkid command should tell you if this is a FAT32 file system or some flavor of file system.   It will also tell you the device being mounted.   Eg.  /dev/sdc1
>   If it is FAT32, you would want to unmount it and plug it into a Windows box and run chkdsk or scandsk on it.  If it has been formatted to a Linux type file system, unmount it and use fsck to scan the disk for errors with a command similar to "fsck /dev/sdc1".     Again blkid or "df -k -l" will tell you the device name.  Make sure the device is unmounted when you run fsck or bad things will happen to your data.
> You might also want to try "smartctl -a /dev/sdc"
> This will give you warnings if the disk is beginning to fail.
> Again, I am using /dev/sdc as an example.

also,  dmesg | grep sdc

to see what physical errors were logged.  (replacing sdc with whatever 
the physical device name is, without any partition number).

john r pierce, recycling bits in santa cruz