File README.largedisk of Package util-linux

Some hints on fdisk and large disks (> 2TB)
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Note that fdisk only supports legacy partition tables.
Legacy partition tables (like DOS) use 32 bit LBA addressing,
which means that you can only address partitions with a starting 
sector and a size with a maximum of 2**32 sectors = 2TB.
This means you can not create partitions that are greater than 2TB 
with fdisk!
If you want to use partition sizes above this limit, you need to use
GUID Partition Tables (GPT) which use 64 bit LBA addressing.
They are supported by parted.