1TB drive being reported as 999GB.  Really bugs my OCD.  Don't think it happened on previous releases.

Size on the left is the raw size of the disk, size on the right is the size available after formating.

6 hours ago, bonienl said:

Size on the left is the raw size of the disk, size on the right is the size available after formating.

 

The 4TB and 6TB drives are reported as 4TB and 6TB, but they're formatted more like 3.8TB and 5.6TB. 

 

Why is the 1TB drive different?   It's inconsistent. 

15 minutes ago, HellDiverUK said:

 

The 4TB and 6TB drives are reported as 4TB and 6TB, but they're formatted more like 3.8TB and 5.6TB. 

 

Why is the 1TB drive different?   It's inconsistent. 

 

Disable automatic number scaling, and have a look at the value reported in bytes.

I get an interesting result if I disable automatic number scaling. All disks are 6 TB WD Reds in this server but Disk1 must be formatted differently:

 

You are not the only one...

 

 

In my experience it has to do with the different versions of XFS used over time to do the initial formatting.

 

That's all well and good, but it's still a 1TB disk, not a 999GB one.  Just as the 4TB and 6TB disks are rounded up to a whole TB, why not with the 1TB?  That is what's not making sense.

Presumably the automatic number scaling algorithm has determined that your disk's formatted capacity in closer to 999 GB than 1000 GB. Perhaps once the capacity exceeds 1 TB the rounding is applied differently to reduce the number of digits displayed. Suppose it rounds to the nearest whole number of whatever units (MB, GB, TB, PB) are chosen. Below 1 TB the units chosen are GB; above 1 TB the units are TB. Would that explain it? Try setting number scaling to TB - does that fix it for you? I can't test it myself as I don't have any 1 TB disks.

 

The function doing the number scaling hasn't changed since unRAID 6.0.

 

It will always round up to the nearest unit, meaning 999.5 MB is rounded to 1000 MB and will be displayed as 1 TB, but 999.4 MB is rounded to 999 MB.

 

Well, yes, the drive is 999.4GB which is fair enough that it's rounding down.  But. it's still a 1TB drive and it seems silly to round down one gigabyte, especially when it's reported as 1TB beside the model number.