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I have a Synology NAS. It has the possibility to encrypt folders. I have enabled it via the web interface. But one of the reasons for actually encrypting these files is that they should be protected even if if someone steals my NAS. I have mounted the drive on the NAS via the web interface.

What happens when the power is cut and the NAS boots again? Is the folder automatically mounted again? Is the key stored in volatile memory, in flash memory or on the hard disk? If it is stored in volatile memory there should be no risk at all.

Compare it to an iPhone. If you enable screen lock, the key is thrown away when activated.

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Mounted where? On the NAS itself or on your computer? – terdon Feb 15 '13 at 21:56
I have tried to clarify the question. I am worried about when the folder is mounted on the NAS and it get stolen. – Johan Karlsson Feb 17 '13 at 18:13
Why don't you just reboot your NAS and see if it mounts? – terdon Feb 18 '13 at 14:10
@terdon I have no real explanation why I did not try this from the beginning. But now I have. It seems that the mount done on the NAS survives a re-boot. This is not exactly what I hoped for. – Johan Karlsson Feb 25 '13 at 13:14
Have a look at the NAS's /etc/fstab file, find the entry for the relevant drive and remove the auto option if present. It might be a good idea to post the fstab here so we can have a look. – terdon Feb 25 '13 at 18:14
up vote 8 down vote accepted

At least with DSM 4.2, there is an option on the share dialog called "Mount automatically on startup." Make sure this options is unticked and if your NAS is disconnected (and stolen), it requires you to enter the password in the web interface to descrypt.


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This works like a charm :) – Johan Karlsson Sep 9 '13 at 9:13

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