我购买了新的 SSD HD 并成功安装了 Windows 10；现在我想使用可启动 USB 密钥安装 Linux Mint。
在 Mint 安装过程中，当我尝试创建分区时，会出现以下情况我看见。
我打开了 GParted 并尝试手动创建分区以/dev/sda准备安装 Mint，当我尝试以 ext4 格式化分区时，GParted 返回此错误：
~$ sudo mkfs.ext4 -F -L "" /dev/sda5
mke2fs 1.42.13 (17-May-2015)
/dev/sda5 is apparently in use by the system; will not make a filesystem here!
因此，我sudo fdisk -l在 GParted 错误之后运行，结果如下：
Disk /dev/loop0: 1.5 GiB, 1647394816 bytes, 3217568 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/sda: 223.6 GiB, 240057409536 bytes, 468862128 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: 0x0e03fec0
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 1026047 1024000 500M 7 HPFS/NTFS/exFAT
/dev/sda2 1026048 417662975 416636928 198.7G 7 HPFS/NTFS/exFAT
/dev/sda3 417665023 460668927 43003905 20.5G f W95 Ext'd (LBA)
/dev/sda5 417665024 460668927 43003904 20.5G 83 Linux
Disk /dev/sdb: 7.2 GiB, 7742685184 bytes, 15122432 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: 0x28e78044
Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 15122431 15120384 7.2G c W95 FAT32 (LBA)
Disk /dev/mapper/ddf1_4d415256454c4c20ab112391ab112391c54a221253fe0001: 223.5 GiB, 239973523456 bytes, 468698288 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
我不明白这/dev/mapper/ddf1_4d415256454c4c20ab112391ab112391c54a221253fe0001是什么，为什么 Linux Mint 安装程序只能看到这个设备而看不到/dev/sda。此外，为什么 GParted 无法格式化ext4格式中的分区？