How to secure erase synology NAS

Before disposing synology NAS, what is the secure way to secure erase all data?
grnowAsked:
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Peter SchultzSenior Network AdministratorCommented:
Remove HDDs, use a Tool like Eraser for secure wiping (https://eraser.heidi.ie) each Disk.
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CESNetwork AdministratorCommented:
or just take a hammer/drill press to the drives
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noxchoGlobal Support CoordinatorCommented:
NAS uses RAID configuration which makes it impossible to use a standard erase approach on RAID. Plus you cannot connect NAS normally as a usual internal drive to a PC. Which is a main requirement. Remove the drives from NAS, connect them internally to a PC and do erase with one of these tools: https://www.techrepublic.com/blog/five-apps/five-hard-disk-cleaning-and-erasing-tools/
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grnowAuthor Commented:
From the NAS management there is this feature secure erase.. does this feature secure erase?
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masnrockCommented:
From the NAS management there is this feature secure erase.. does this feature secure erase?
That's a tough call to make, because without knowing exactly how it works, you cannot really determine that. If you want to know for sure that you've done the best that can be done, go with either of the first 2 options presented. I personally use @Active KillDisk, but it's not a free product.
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noxchoGlobal Support CoordinatorCommented:
From the NAS management there is this feature secure erase.. does this feature secure erase?
It deletes the data. But with data recovery tool one could recover some deleted data from the "erased" drives.
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serialbandCommented:
How secure do you actually need to secure erase?

If you just want prevent the casual user from recovering data.  You should be able to mount the entire NAS RAID as a single volume and "erase" with zeros first.  If you mount it on Linux or OSX, you can just write /dev/zero to a file on the disk.  I would also swap the order of the disks around, then make a new volume before writing zeros.  Writing to the entire RAID will be much quicker than writing to each disk separately.

If you need to do a DoD wipe, you can still do the same thing and run the process overnight.  Even if they recreate original volume and disk order, you've done a wipe on the data sectors.

If you are time pressed, you should just pull out the disks and physically destroy them.  Don't waste hours or days erasing disks that you don't want people to ever recover.
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