On Monday, 26 May 2014 18:54:35 UTC+1, Benjamin Phillips wrote:
 

> … Disk Utility shows a non-mounted volume within the disk. I have tried 
> pressing mount but it tells me it has failed and needs first aid. When I 
> click verify disk it informs me that it has to be repaired. …
>

 OK, in the screenshot there's the explanation: 

Filesystem too big (122075 clusters) for non-FAT32 partition

There's also the (generic) suggestion to click 'Repair Disk' but for the 
given file system, I doubt that an attempt to repair can be 
effective. https://discussions.apple.com/message/23718121#23718121 is 
comparable. 

You could see whether the file system is readable with a different 
operating system – maybe Windows or Linux – but I should not attempt to 
write to the drive. Aim to copy the files to a separate drive with a more 
suitable file system. 

Hope that helps
Graham

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