Fix external SSD file system on Mac OS X

I use Retina MacBook Pro, the internal SSD capacity is 256G, no enough for me.
so I usual attach a usb SSD driver, usb 3.0 speed is very good for SSD, but the SSD driver file system crash 
three times.

some time can you Disk Utility.app  fix it, but today ,the tool give me

rMBP:~ yarshure$ sudo fsck_hfs -ry  /dev/disk1s2
** /dev/rdisk1s2
   Executing fsck_hfs (version diskdev_cmds-557.3~1).
** Checking Journaled HFS Plus volume.
   The volume name is VM
** Checking extents overflow file.
** Checking catalog file.
** Rebuilding catalog B-tree.
** Rechecking volume.
** Checking Journaled HFS Plus volume.
   The volume name is VM
** Checking extents overflow file.
** Checking catalog file.
   Incorrect number of thread records
(4, 220)
** Checking multi-linked files.
** Checking catalog hierarchy.
** Checking extended attributes file.
** Checking volume bitmap.
** Checking volume information.
** Repairing volume.
** Rechecking volume.
** Checking Journaled HFS Plus volume.
   The volume name is VM
** Checking extents overflow file.
** Checking catalog file.
   Incorrect number of thread records
(4, 220)
** Checking multi-linked files.
** Checking catalog hierarchy.
** Checking extended attributes file.
** Checking volume bitmap.
** Checking volume information.
** Repairing volume.
** Rechecking volume.
** Checking Journaled HFS Plus volume.
   The volume name is VM
** Checking extents overflow file.
** Checking catalog file.
   Incorrect number of thread records
(4, 220)
** Checking multi-linked files.
** Checking catalog hierarchy.
** Checking extended attributes file.
** Checking volume bitmap.
** Checking volume information.
** The volume VM could not be repaired after 3 attempts.

 the file system too weak, I search the web, found DiskWarrior.app.
It help me fixed the crash system.