求救硬碟問題 - Linux

原本有一顆硬碟(1.2TB)mount起來成home7,
UUID=5f24400c-1df6-414e-ab34-2d211c569c69 /home7 ext4 defaults

但不知道為什麼這顆硬碟變成了 /dev/mapper
/dev/mapper/ubuntu102--vg-root: UUID="5f24400c-1df6-414e-ab34-2d211c569c69"
TYPE="ext4"

透過指令: ls /dev/[sh]d*
/dev/sda /dev/sda1 /dev/sda2 /dev/sda5 /dev/sdb /dev/sdc /dev/sdd
/dev/sdd1 /dev/sdd2 /dev/sdd5 /dev/sde /dev/sdf /dev/sdf1 /dev/sdf2
/dev/sdf5

執行: sudo fdisk /dev/sdf
Command (m for help): p
Disk /dev/sdf: 1.1 TiB, 1200210141184 bytes, 2344160432 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0005f611

Device Boot Start End Sectors Size Id Type
/dev/sdf1 * 2048 499711 497664 243M 83 Linux
/dev/sdf2 501758 585871359 585369602 279.1G 5 Extended
/dev/sdf5 501760 585871359 585369600 279.1G 8e Linux LVM


這邊我有點搞不懂為什麼會衍伸出sdf1 sdf2 sdf5....

想詢問我要怎麼做才可變成把這顆硬碟變回單純的/dev/sdf
然後把他mount起來當空間使用呢?
感謝各位




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