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I have deleted NTFS drive in Windows. After I have added it in Linux I did a quick format to Ext4 (sda9), but it says that 12 GB or (2% of the drive capacity) is used.

Is this normal? Or should I do a full format? Also moving from NTFS to Ext4 is it recommended to do a full format (although quick format seems to be working), does it improves efficiency?

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The space is probably taken by reserved blocks, which is usually set to 5%. You can check with tune2fs, assuming /dev/sda1 is the right partition. 

sudo tune2fs -l /dev/sda1 | grep -i 'block count

To set the percentage of reserved block to, say, 1%, use the following:

sudo tune2fs -m 1 /dev/sda1
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  • I checked it. It's exactly 5%. But my used space is about 2%
    – Porcupine
    Aug 19, 2018 at 15:15

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