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Forum Discussion
Solved
*actual* disk space availability
Could someone please explain to me why if I plug in a 4 TB unit, create a JBOD volume, then it's only 3.63Tb ??
Where has the space gone?
I own a second NAS from WD and every 4TB unit has 3.98TB available...
Thank you
It's only that the WD unit is using a different unit of measurement.
There are two units for disk capacity - TB and TiB
1 TB -> 1000*1000*1000*1000 bytes
1 TiB -> 1024*1024*1024*1024 bytes.
Many operating systems - including windows - use TiB units. So the ReadyNAS does too (although it labels the space as TB). Disk drive manufacturers report space in TB..
4 TB = 4*(1000/1024)*(1000/1024)*(1000/1024)*(1000/1024) TiB - which works out to ~3.64 TiB.
3 Replies
It's only that the WD unit is using a different unit of measurement.
There are two units for disk capacity - TB and TiB
1 TB -> 1000*1000*1000*1000 bytes
1 TiB -> 1024*1024*1024*1024 bytes.
Many operating systems - including windows - use TiB units. So the ReadyNAS does too (although it labels the space as TB). Disk drive manufacturers report space in TB..
4 TB = 4*(1000/1024)*(1000/1024)*(1000/1024)*(1000/1024) TiB - which works out to ~3.64 TiB.
Thank you for your clarification.
I didn't consider that tdifferent systems may use different standards.
That tricked me into thinking that some nas had a better use of disk space than the other..
thx
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