Fortunately, the cache software is available for download from Lenovo's website. So that I downloaded it and installed it, while I realize this cache should be used for the hard drive only, not for the SSD. While looks like the eccmd provided only very limited options:
ExpressCache Command Version 1.3.110.0
Copyright?2010-2013 Condusiv Technologies.
Date Time: 1/21/2015 20:27:16:729 (THINKPAD #2)
USAGE:
ECCmd [-NOLOGO]
[-INFO | -PARTITION | -FORMAT]
-NOLOGO - No copyright message will be displayed.
-INFO - Display ExpressCache activity information.
-PARTITION - Create an ExpressCache partition.
[DriveId] - Optional drive ID
[PartSize] - Optional partition size in MB
-FORMAT - Format the cache volume.
After searching Google, I found there are some options in previous version:
-EXCLUDE - Exclude a drive from being cached.
DriveLetter - Drive letter
-CLEAREXCLUSIONS - Clear all cache exclusions.
-PRELOAD - Preload a folder or a file into the cache
FileName - File or folder name to be cached
[UsageCount] - Optional file usage count.