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I want to do two partitions for my SD card with FAT and EXT4 using Ubuntu.

For this, I found two commands:

mkdosfs /dev/sda1 -n 
mke2fs /dev/sda1 -L

But how should I specify the size, for FAT I need 200MB and rest with EXT4.

When tried to give mkdosfs /dev/sda1 -n I got an error.

sudo mkdosfs /dev/sda
mkfs.fat 3.0.28 (2015-05-16)
mkdosfs: unable to open /dev/sda: Device or resource busy
simhumileco
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Sijith
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    When I see /dev/sda1 I'm thinking that you try to edit a partition on the drive, that your system is booted from. You should boot from one drive and edit partitions on another drive. If you boot from a live USB drive with Ubuntu, you can use gparted, which has a graphical user interface. It is quite easy to use in order to edit partitions and create file systems. – sudodus Mar 04 '19 at 09:21
  • I cross checked and its my sdcard only, even the size is showing correctly – Sijith Mar 04 '19 at 09:25
  • So your Ubuntu system is booted from another drive. Fine :-) gparted is already there in Ubuntu live, but in an installed system, you must install it, sudo apt install gparted. You must also unmount all partitions on the SD card before you start editing the partitions. – sudodus Mar 04 '19 at 09:28
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    Possible duplicate of How to resize partitions? You must create partitions first, then you can create a filesystem in them. Or you can do it all in Gparted. If you want specific help for your situation, please [edit] your question to include the output of the lsblk command. – Melebius Mar 04 '19 at 11:56
  • Iam using VM and gparted is throwing error – Sijith Mar 05 '19 at 05:40
  • What error? Please [edit] your question with specific information (e.g. screenshot of GParted and/or the lsblk output I requested earlier). – Melebius Mar 05 '19 at 06:54

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