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TB Hard drives in Synology Disk Station DS409

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Last Modified: 2013-11-14
Hello experts,

I have purchased a synology ds409 from newegg.com and four 1.5 TB hard drives.

The hard drives show up as 1.36TB, and when i formatted them into a single RAID5 volume, i only have 4TB total on the volume.

Where did the other 2TB of space go? i know some went to the raid config, but why does only 1.36 show up? That's like 140 x 4 = 560GB's.. thats a ton of drive space that is missing.
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Commented:
That's about right then. Essentially with RAID 5 you get the combined total drive capacity -1 disk so...

4 x 1.5TB = 6TB - 1.5TB = 4.5TB. This is the RAW capacity so the ~4TB formatted capacity you are seeing is correct.

Author

Commented:
So RAID 5 uses 1 disk for the striping and parity, but the space for this is distributed over an entire disk?

why is the raw capacity for a 1.5 tb drive only 1.36? That's 140GB which is a lot of space and more than my internal hdd on my computer..
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Commented:
Anything else we can help you with regarding this?

Author

Commented:
guess not.. didn't know if you were still trying to locate the link. No worries. Thanks a bunch for your help.

Commented:
Another reason for the loss of space is that the Synology NAS needs to install it's 'OS' onto the drives in order for it to function. This creates a series of partitions which swallows up a reasonable amount of space. It's usually around the 2GB per disk level, so you would be looking at losing another 10GB or so there.
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