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Author Topic: No mountable file systems error  (Read 2319 times)

ssh

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No mountable file systems error
« on: August 17, 2015, 05:19:23 PM »
Greetings...

I have a large (4TB) disk with two Espionage sparseimages on it. I have been using these for a while, and they contain a substantial amount of data each (Espionage reports one at 2.75TB of 2.84 and the other at 568GB of 579). Starting last week (while I was on a trip away from my home office where these disks live connected to my Mac Pro), the larger of the two stopped decrypting. At first, there was no visible error from Espionage; it just never stopped attempting to mount it. However, when I went through the steps manually (copy the password, double click, enter password), the system began to give the infamous "no mountable file systems" error.

I've run disk util on the disk and it returns no errors and nothing to fix.

The disk is also a RAID mirror that uses SoftRAID.

Any ideas what I might try to get it back? The permissions on the two images are the same, and the other opens and mounts fine.

Thank you!

zsolt

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Re: No mountable file systems error
« Reply #1 on: August 17, 2015, 08:13:35 PM »
As you probably know, Espionage is using OS X disk images to protect data (encrypted sparse bundle).
The logic behind these disk images are entirely Apple's, we are just using standard OS X commands to create a disk image of specific type, size and with specific password, the rest is done by OS X. When you unlock a folder, we send a request to OS X to mount this disk image with the password we provide.
When you add or remove files to/from protected folder, we are telling OS X to copy, delete files from the mounted volume, OS X does it for us.

The error you see is coming from OS X because it cannot do what we request. But all the operations are going through OS X so if something goes wrong, it is just the command which we gave, but was not executed properly, either because of a bug in OS X or because of an unexpected event, like for example disk corruption, power outage or such.

So, after a long preparation, the short answer is "no", we cannot do anything about it. You can try to run disk utility repair on it, this is what you did already. So the only other thing would be to restore from backup.

Soft RAID is nice, but it will propagate the data in a dumb way, like any other RAID, if the original is corrupted, it will propagate the corruption too (if it is a Mirrored RAID), so no help here.

Backup is an annoyance, util you need it....:-((((

Rgds
Zsolt
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ssh

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Re: No mountable file systems error
« Reply #2 on: August 18, 2015, 03:54:30 AM »
Fair enough. I had read an earlier thread where there was an implication that there might be some additional options.

Thanks, anyway.