External Hard drive shows in Disk Utility, but not in Finder

[chown33]

The partition does seem to be greyed out as well. I'm not quite sure how to boot into the recovery partition...View attachment 567558

That looks like you have (or had) a RAID 0 external, and half of it is no longer working.

It appears to be expecting a 4 TB "Striped RAID Set". "Striped RAID" is RAID 0:
https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_0

It also appears to be showing that only one 2 TB slice (physical 2 TB disk) is actually working.

With only half of a striped RAID working, I strongly suspect you're out of luck unless you can find a way to revive the failed slice. A RAID 1 is "mirrored" as opposed to "striped", and a failure of one slice in that case would be recoverable. Or if you're lucky, it's as cowfish suggested, and is a problem with the enclosure or RAID controller therein. You should probably contact LaCie tech support.

Some of this is guesswork based on the images posted, since you didn't identify exactly what LaCie external model this is.

 

[AppleNewton]

looks like one of the drives in the raid disk set is bad. contact LaCie or replace it with another drive.

 

[alvd]

usually when I see disk5s2 in my drives, either something with the enclosure is bad or the drive went offline without being properly ejected.

Have you tried clicking on the drive in Disk Utility and did a verify disk or Unmount then remount in Disk Utility, sometimes that has helped my drives come back online

I'm having the same issue, but when I verify the disk is says I need to repair it. Once I do that, it says I need to restore the disk and back up as many files as possible. How do I back up the files if I cannot access the external hard drive because it is not showing up in the finder?

 

[massulikc]

DO THE FOLLOWING:
here is a script ... open up script editor and paste this in

tell application "System Events" to set visible of disk "Name of Hard Drive" to true
tell application "Finder" to quit
delay 1
tell application "Finder" to launch
delay 1
tell application "System Events" to quit


then change "Name of Hard Drive" to the name of whatever hard drive you want and click run and it will pop up on your desktop!!!
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Works beautifully for my problem where my drive just doesn't show up in the Finder Desktop or in the Computers. I did see it in Disk Utility, it just never "mounted" it so to speak, it thought it was already mounted.

 

[ssimo...]

usually when I see disk5s2 in my drives, either something with the enclosure is bad or the drive went offline without being properly ejected.

Have you tried clicking on the drive in Disk Utility and did a verify disk or Unmount then remount in Disk Utility, sometimes that has helped my drives come back online

Thank you, it works

 

[tdog123]

DO THE FOLLOWING:
here is a script ... open up script editor and paste this in

tell application "System Events" to set visible of disk "Name of Hard Drive" to true
tell application "Finder" to quit
delay 1
tell application "Finder" to launch
delay 1
tell application "System Events" to quit


then change "Name of Hard Drive" to the name of whatever hard drive you want and click run and it will pop up on your desktop!!!
Reply With Quote

This worked perfectly for me. Thanks so much!