I got a weird problem recently. I installed a new 1T SSD for my computer (Lenovo L14 Gen2a AMD 20X50019US), however, the file system of this SSD is ext4 so that I couldn't detect it in Windows11 system, but within the WSL of Windows, I could see the disk is mounted under the root directory.
hengyuan@Hengyuan-Lenovo:~$ df -hTFilesystem Type Size Used Avail Use% Mounted onnone tmpfs 3.6G 4.0K 3.6G 1% /mnt/wsldrivers 9p 280G 82G 199G 30% /usr/lib/wsl/driversnone tmpfs 3.6G 0 3.6G 0% /usr/lib/modulesnone overlay 3.6G 0 3.6G 0% /usr/lib/modules/5.15.153.1-microsoft-standard-WSL2/dev/sdc ext4 1007G 7.3G 949G 1% /none tmpfs 3.6G 88K 3.6G 1% /mnt/wslgnone overlay 3.6G 0 3.6G 0% /usr/lib/wsl/librootfs rootfs 3.6G 2.1M 3.6G 1% /initnone tmpfs 3.6G 816K 3.6G 1% /runnone tmpfs 3.6G 0 3.6G 0% /run/locknone tmpfs 3.6G 0 3.6G 0% /run/shmtmpfs tmpfs 4.0M 0 4.0M 0% /sys/fs/cgroupnone overlay 3.6G 92K 3.6G 1% /mnt/wslg/versions.txtnone overlay 3.6G 92K 3.6G 1% /mnt/wslg/docC:\ 9p 280G 82G 199G 30% /mnt/cD:\ 9p 196G 9.0G 187G 5% /mnt/dsnapfuse fuse.snapfuse 128K 128K 0 100% /snap/bare/5snapfuse fuse.snapfuse 75M 75M 0 100% /snap/core22/1380snapfuse fuse.snapfuse 74M 74M 0 100% /snap/core22/864snapfuse fuse.snapfuse 92M 92M 0 100% /snap/gtk-common-themes/1535snapfuse fuse.snapfuse 41M 41M 0 100% /snap/snapd/20290snapfuse fuse.snapfuse 39M 39M 0 100% /snap/snapd/21759snapfuse fuse.snapfuse 132M 132M 0 100% /snap/ubuntu-desktop-installer/1276snapfuse fuse.snapfuse 132M 132M 0 100% /snap/ubuntu-desktop-installer/1286However, when I try to umount the new disk /dev/sdc, I got the following error
hengyuan@Hengyuan-Lenovo:~$ sudo umount /dev/sdc[sudo] password for hengyuan:umount: /snap: target is busy.and even more confusing, when I run lsblk command, I found the disk was actually mounted under 4 directories
hengyuan@Hengyuan-Lenovo:~$ lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTSsda 8:0 0 388.6M 1 disksdb 8:16 0 2G 0 disk [SWAP]sdc 8:32 0 1T 0 disk /snap /media/SSD-1T /mnt/wslg/distro /only the /media/SSD-1T directory is the place I wanted it to mount to, and I have added UUID="9d1fd00a-147d-4c70-941d-876c5a850c18" /media/SSD-1T ext4 defaults 0 0 this line in the /etc/fstab file. However, I am not sure why it was also mounted under the other 3 directories. How can I completely unmount this disk so that I can either format it to NTFS or only mount it to /media/SSD-1T ? Thank you!