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koumaza/cal-partsize.md

Last active December 12, 2020 16:35
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Calculate Partition Size
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cal-partsize.md

Step 1 - Run fdisk

fdisk -l /dev/YOURDEVICE
## Or
fdisk -l /dev/block/YOURDEVICE
## Or
fdisk -l /dev/block/by-name/YOURDEVICEPARTTIONNAME

# Which is my device
df -a # Outputs mount-points

Step 2 - Calculate

There are four things to watch here.

  • Sector Size
  • Start (sector)
  • End (sector)
  • Name
Run this
# Posix Shell
echo $(( ( Start - End ) * SectorSize ))
# Fish
math "( Start - End ) * SectorSize )"
outputs as byte

byte*10^-6=megabyte

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