加了块ssd硬盘，默认的分区名是 "未命名1", 有点二，改了个好理解的。

$ mount
/dev/disk0s2 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk1s2 on /Volumes/Macintosh HD (hfs, local, journaled)
$sudo diskutil rename /dev/disk0s2 "SSD盘"