我的 160G SSD 出了点问题。它在 fdisk 中显示为 8MB 驱动器：
Disk /dev/sda: 8 MB, 8388608 bytes
255 heads, 63 sectors/track, 1 cylinders, total 16384 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 identifier: 0x00000000
Disk /dev/sda doesn't contain a valid partition table
那里的几乎所有内容都已备份，但我想创建一个图像只是为了保存。dd 似乎只能看到 8MB 的驱动器：
dd if=/dev/sda of=/home/ubuntu/data/sda.img conv=sync,noerror bs=64K count=160G
128+0 records in
128+0 records out
8388608 bytes (8,4 MB) …