我有一个 512GB 的 SSD，用来存储大部分备份和数据，还有一个 1TB 的 SSD，但使用不多。我一直想交换它们，但我没有足够大的另一个驱动器来存储任一驱动器的映像。有没有办法在不使用大型中间存储的情况下交换驱动器上的内容？
512 GB 驱动器：
/dev/sdb1 469G 290G 155G 66% /mnt/ssd
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 79.9M 1 loop /snap/core/9069
loop1 7:1 0 79.9M 1 loop /snap/core/8936
sda 8:0 0 119.2G 0 disk
├─sda1 8:1 0 256M 0 part
└─sda2 8:2 0 119G 0 part /
sdb 8:16 0 477G 0 disk
└─sdb1 8:17 0 477G 0 part /mnt/ssd
mmcblk0 179:0 0 29.8G 0 disk
├─mmcblk0p1 179:1 0 256M 0 part /boot
└─mmcblk0p2 179:2 0 29.5G 0 part
/dev/sdb1: UUID="5c293db6-6b16-48db-af86-732e081b2a0e" TYPE="ext4" PARTUUID="3c32c42c-01"
1tb 驱动器：
Filesystem Size Used Avail Use% Mounted on
/dev/root 938G 42G 850G 5% /
devtmpfs 328M 0 328M 0% /dev
tmpfs 458M 0 458M 0% /dev/shm
tmpfs 92M 1.3M 91M 2% /run
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 458M 0 458M 0% /sys/fs/cgroup
/dev/loop0 142M 142M 0 100% /snap/chromium/1139
/dev/loop2 142M 142M 0 100% /snap/chromium/1146
/dev/loop1 49M 49M 0 100% /snap/core18/1753
/dev/loop3 62M 62M 0 100% /snap/lxd/14894
/dev/loop4 63M 63M 0 100% /snap/gtk-common-themes/1506
/dev/loop5 49M 49M 0 100% /snap/core18/1708
/dev/loop6 62M 62M 0 100% /snap/lxd/14958
/dev/loop7 24M 24M 0 100% /snap/snapd/7267
/dev/mmcblk0p1 253M 141M 112M 56% /boot/firmware
tmpfs 92M 4.0K 92M 1% /run/user/1000
tmpfs 92M 4.0K 92M 1% /run/user/1001
tmpfs 92M 8.0K 92M 1% /run/user/116
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 141.6M 1 loop /snap/chromium/1139
loop1 7:1 0 48.4M 1 loop /snap/core18/1753
loop2 7:2 0 141.6M 1 loop /snap/chromium/1146
loop3 7:3 0 61.4M 1 loop /snap/lxd/14894
loop4 7:4 0 62.1M 1 loop /snap/gtk-common-themes/1506
loop5 7:5 0 48.4M 1 loop /snap/core18/1708
loop6 7:6 0 61.5M 1 loop /snap/lxd/14958
loop7 7:7 0 23.5M 1 loop /snap/snapd/7267
sda 8:0 0 953.9G 0 disk
└─sda1 8:1 0 953.9G 0 part /
mmcblk0 179:0 0 29.2G 0 disk
├─mmcblk0p1 179:1 0 256M 0 part /boot/firmware
└─mmcblk0p2 179:2 0 28.9G 0 part
/dev/mmcblk0p1: LABEL_FATBOOT="system-boot" LABEL="system-boot" UUID="85F3-CC2B" TYPE="vfat" PARTUUID="da84cd12-01"
/dev/mmcblk0p2: LABEL="writable" UUID="b96d647f-679e-4582-87d0-2d8c7afc91f4" TYPE="ext4" PARTUUID="da84cd12-02"
/dev/sda1: UUID="bc8e0523-a221-4e72-a3a6-077762464ae4" TYPE="ext4" PARTUUID="8b3ac4b5-01"
/dev/loop0: TYPE="squashfs"
/dev/loop1: TYPE="squashfs"
/dev/loop2: TYPE="squashfs"
/dev/loop3: TYPE="squashfs"
/dev/loop4: TYPE="squashfs"
/dev/loop5: TYPE="squashfs"
/dev/loop6: TYPE="squashfs"
/dev/loop7: TYPE="squashfs"