I have 4 partitions on my Macbook Pro: El Capitan, Mavericks, Snow Leo 10.6.8 and an edrive formatted from 10.9.
From edrive I can check and rebuild all volumes. It works ok - even that it seems take longer time with 8.0.4!
But when I want to check volume structures on 10.9 from 10.11 it does not work at all. Neither from TTP or Disk Utility. It seems that the 10.9 volume does not unmount. Sometimes I have the same problem with the SnowLeo volume, but mostly it works.
From edrive I can check and rebuild all volumes. It works ok - even that it seems take longer time with 8.0.4!
But when I want to check volume structures on 10.9 from 10.11 it does not work at all. Neither from TTP or Disk Utility. It seems that the 10.9 volume does not unmount. Sometimes I have the same problem with the SnowLeo volume, but mostly it works.