$ lsblk -fs

NAME  FSTYPE  LABEL     UUID                                 FSAVAIL FSUSE% MOUNTPOINT
sda1  ext4    nixos     f5acda50-a0c9-4959-ae2a-850509c99f92   12.8G    82% /
└─sda
sda2  swap    swap      4f224ff5-ee90-4e4e-8775-5df22c3b4dfc                [SWAP]
└─sda
sda3  vfat    boot      DA9D-ED21                             432.6M    15% /boot
└─sda
sdb1  swap              6a0ea95b-5278-496b-90d1-b633e24c6ae0
└─sdb
sdb2  ext4              ebda3ed6-6758-4e33-9f96-2432d28e4429       0   100% /data
└─sdb
sdc1  iso9660 NIXOS_ISO 1970-01-01-00-00-01-00
└─sdc iso9660 NIXOS_ISO 1970-01-01-00-00-01-00
sdc2  vfat    EFIBOOT   1234-5678
└─sdc iso9660 NIXOS_ISO 1970-01-01-00-00-01-00

$ df -h

Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        800M     0  800M   0% /dev
tmpfs           7.9G     0  7.9G   0% /dev/shm
tmpfs           4.0G  6.7M  3.9G   1% /run
tmpfs           7.9G  336K  7.9G   1% /run/wrappers
/dev/sda1       102G   84G   13G  87% /
tmpfs           7.9G     0  7.9G   0% /sys/fs/cgroup
/dev/sda3       510M   78M  433M  16% /boot
tmpfs           1.6G  4.0K  1.6G   1% /run/user/1000
/dev/sdb2        49G   49G     0 100% /data

$ fdisk -l /dev/sdb
Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000DM003-1CH1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: DAF8F0BF-9E9B-43F4-83A5-6B63DCBDC335

Device        Start        End    Sectors   Size Type
/dev/sdb1      2048   50333695   50331648    24G Linux swap
/dev/sdb2  50333696 1953525134 1903191439 907.5G Linux filesystem