Newly formatted drive has used space already?

So I formatted an external 8TB drive as ext4.
Did a reboot.
Then checked on it and got this:

osmc@osmc:~$ df
Filesystem           1K-blocks     Used  Available Use% Mounted on
devtmpfs                774712        0     774712   0% /dev
tmpfs                   899232    16868     882364   2% /run
/dev/vero-nand/root   14499760 10223996    3516164  75% /
tmpfs                   899232        0     899232   0% /dev/shm
tmpfs                     5120        0       5120   0% /run/lock
tmpfs                   899232        0     899232   0% /sys/fs/cgroup
/dev/sda1           7811937256    94236 7811826636   1% /media/Seagate 8TB 3
tmpfs                   179844        0     179844   0% /run/user/1000
osmc@osmc:~$ sudo tune2fs -l /dev/sda1 | grep 'Reserved block count'
Reserved block count:     0

I know it’s small, but any ideas why this would be?

Ext4 is a journaled filesystem and by nature quite complicated. That are reserved blocks

Just like with any filesystem, there is built in overhead. You will see the same with BTRFS, NTFS, FAT, etc.

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None of the other drives I have formatted with ext4 have done that.

I just formatted an unused 4TB drive that I had handy with EXT4.

/dev/sdb1                           3844628496      69636 3649193332   1% /media/brian/f5011889-aadb-40a0-bf1a-d835cbe411d6

or for more human readable

/dev/sdb1                            3.6T   69M  3.4T   1% /media/brian/f5011889-aadb-40a0-bf1a-d835cbe411d6

So that’s totally normal for EXT4.

And just for fun, the same drive formatted with NTFS:

/dev/sdb1                           3906982908     185216 3906797692   1% /media/brian/692CC38B6FFF6444


/dev/sdb1                            3.7T  181M  3.7T   1% /media/brian/692CC38B6FFF6444

And more fun, reformat the drive as exFAT:

/dev/sdb1                           3906982912     123392 3906859520   1% /media/brian/BB05-2DAD


/dev/sdb1                            3.7T  121M  3.7T   1% /media/brian/BB05-2DAD
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Weird that on other drives I have done as ext4 I have had 0% used after formatting.
Maybe I used some crazy settings on those previous formats.
But thinking about it now I don’t see how that would be possible.
Probably just me remembering incorrectly.
I’ll be formatting a different drive to ext4 tomorrow night so I’ll see what that one does.

We’ve had a longish exchange of words regarding reserved space etc. in this thread starting (for me) at Best HDD format for Vero 4k+? (And how to do so!) - #37 by JimKnopf … till the end.

Just did another drive and same thing.
I must just be an idiot and remembered incorrectly with the other drives I’ve done.


So now I need to change the drive label.
I tried e2label /dev/sda1 <label> and it didn’t give me an error or confirmation but then I checked and the label is still the same.
Am I missing something here?

Never mind, the change showed up after a reboot.