df -h to see formatted size, but how to see actual?
I believe one of my disks is 3TB but formatted as 2TB but not sure which. (they're remote so I can't look!)
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You could try parted
sudo parted -l
or if you know the particular disk's block device e.g. /dev/sda
sudo parted /dev/sda print
As well as looking at the formatted partition size(s), take note of the 'Partition Table' line - if the disk was formatted with 'Partition Table: msdos' then you may be bumping up against the intrinsic 2TB limit - the disc may need to be converted to a GPT partition table in order to access the full 3TB