[SOLVED] Qnap Tr-004 with (4) 4Tb drives

[Birdy60]

Yesterday I set up the Qnap TR-004 with (4) Tb WD red drives.
I set the dip switched for hardware controlled Raid 10.
I understand I loose 1/2 of the total drives capacity with raid 10.
Once the drives were installed, it required formatting.
My question is...Windows 10 disk management is showing the raid group as 7.28Tb on a primary partition.
I'm assuming the remaining 8Tb of the total 4x4TB= 16Tb is being utilized in the background by the TR-004 unit for redundency and speed, but is invisible to me.

Under the Qnap External Raid Manager...Raid group 1 "Raid 10" (336mb/7.28Tb)
Then each drive is listed as 3.64Tb each.
Did I set this up correctly ?
Thanks

 

[popatim]

That's about right. I'm not sure what overhead the Qnap Raid uses.
A 4TB drive (in decimal value) is 3.72TB in PC-land.

 

[USAFRet]

That is exactly correct. I have a TR-004 with 4x 4TB Ironwolf, no RAID.

An 8TB drive or volume is read in Windows as 7.28TB. That is normal. Nothing related to the RAID 10, QNAP, whatever.
It is simply Base 10 vs Base 2, human vs computer. Marketing vs reality.

It would read the same if it were a single 8TB drive. Or a RAID 1 with 2x 8TB.

The "RAID 10" is a mirrored RAID 0. Stripe + Mirror.
https://searchstorage.techtarget.com/definition/RAID-10-redundant-array-of-independent-disks
4+4, (RAID 1) mirrored to 4+4.
4+4 = 7.28TB.