背景
Ubuntu 22.04安装在固态硬盘，现在又添加了一块机械硬盘。
添加的机械硬盘的文件系统已经是ext4了
步骤
1、用fdisk查看设备信息
就是为了得到机械硬盘的路径，如下：/dev/sda即是
root@cap-server:~# fdisk -l
Disk /dev/loop0: 63.28 MiB, 66355200 bytes, 129600 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
Disk /dev/loop1: 111.95 MiB, 117387264 bytes, 229272 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
Disk /dev/loop2: 49.84 MiB, 52260864 bytes, 102072 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
Disk /dev/nvme0n1: 3.73 TiB, 4096805658624 bytes, 8001573552 sectors
Disk model: ZHITAI TiPlus7100 4TB
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: gpt
Disk identifier: 26861BCB-181C-4704-ABBE-FB24F84368DF
Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 2203647 2201600 1G EFI System
/dev/nvme0n1p2 2203648 6397951 4194304 2G Linux filesystem
/dev/nvme0n1p3 6397952 8001570815 7995172864 3.7T Linux filesystem
Disk /dev/sda: 4.55 TiB, 5000981078016 bytes, 9767541168 sectors
Disk model: WDC WD50NPZZ-00A
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 3.72 TiB, 4093527457792 bytes, 7995170816 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
2、准备好机械硬盘要挂载到的路径
root@cap-server:~# cd /mnt
root@cap-server:/mnt# ls
disk5t
3、将挂载命令写入fstab
写入的目的是服务器每次重新启动，都会执行挂载：
root@cap-server:/mnt# vi /etc/fstab
root@cap-server:/mnt# echo `blkid /dev/sda | awk '{print $2}' | sed 's/\"//g'` /mnt/disk5t ext4 defaults 0 0 >> /etc/fstab
无需重新启动，下述命令即可挂载：
root@cap-server:/mnt# mount /mnt/disk5t
挂载成功了
看到了机械硬盘里以前的文件夹
root@cap-server:/mnt# ls
disk5t
root@cap-server:/mnt# cd disk5t
root@cap-server:/mnt/disk5t# ls
lost+found mssql_bak nextcloud temp