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Forum Discussion
free space less than expected...
Quick question about drive space....(Readynas 314) I have qty 2 - 3tb drives and I am in the process of setting them up as RAID 1. Its gonna take 7 hours (argh!!) for this volume to be created but...
Drive manufacturers use a different base for measurements. Using base 10 drive manufacturers have 1KB=1000 Bytes, 1MB = 1000 KB etc.
Whereas the NAS considers 1KB = 1024 Bytes, 1MB = 1024 KB.
It's the same amount of space, just a different way of measuring it (much like measuring distance in miles vs kilometres). Just like you'd find with say a 500GB disk in a PC you would see it reported as having perhaps about 465GB in capacity though as you are dealing with larger and larger volumes it becomes more noticeable due to the compounding.
So 3TB (base 10) = 3 / 1024^4 * 1000 ^ 4 = 2.73 TB (base 2)
Allowing for overheads 2.65TB is very reasonable.
Whereas the NAS considers 1KB = 1024 Bytes, 1MB = 1024 KB.
It's the same amount of space, just a different way of measuring it (much like measuring distance in miles vs kilometres). Just like you'd find with say a 500GB disk in a PC you would see it reported as having perhaps about 465GB in capacity though as you are dealing with larger and larger volumes it becomes more noticeable due to the compounding.
So 3TB (base 10) = 3 / 1024^4 * 1000 ^ 4 = 2.73 TB (base 2)
Allowing for overheads 2.65TB is very reasonable.
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