how to unmount a SD card with 2 partitions completely in a USB card reader (in order to unplug it safely)?

[dsyleixa123]

how to unmount a SD card with 2 partitions completely in a USB card reader (in order to unplug it safely)?

lsblk shows:

sda
|->sda1
|->sda2

but if I enter
sudo umount sda
it fails
(sth like "mountpoint not found")

which is the correct way?

[RonR]

sudo umount /dev/sda1
sudo umount /dev/sda2

[dsyleixa123]

same errors:

sudo umount sda1:
mountpoint not found

sudo umount sda2:
mountpoint not found

[DougieLawson]

sudo apt install eject
sudo eject /dev/sda

[RonR]

Then they probably aren't mounted (lsblk reports block devices which may or may not be mounted).

Run 'sudo mount | grep sda' to determine if either is mounted.

[dsyleixa123]

they ARE mounted! (I can access the contents via file commander (mc)

[Ernst]

Code: Select all

sudo umount /dev/sda{1,2}

or

Code: Select all

sudo umount /dev/sda1
sudo umount /dev/sda2

[dsyleixa123]

@dougie:
thank you, eject works !

@Ernst: thanks, appearently a "/dev/..." was missing in my cmd line....

ceterum censeo: Non-GUI Linux is really an unbearable, unreasonable and unconscionable agony for common PC users ( an outrageous sea of troubles, Skakespeare would probably say.... )

[dsyleixa123]

next issue:
after having "eject"ed and then plugged to my Win PC it gives an error that the file system might be damaged and should be checked (perhaps out of unsafe ejecting before).
Checking then does not show up errors though.
Is that normal?
how can this issue be prevented?

[rpdom]

What format are the partitions in?

If they are not one of the very few that Windows recognises it will scream and say they need formatting which is a lie.

[dsyleixa123]

the last device was a USB stick having just 1 FAT32 partition (sda -> sda1)
the error does not show up if the USB stick was NOT "eject"ed and not removed but the Raspi was shutdown and powered-off before.