MyBook Studio II Mac 4TB - FW800 Daisey Chain Questions

I own 5 MyBook Studio II Mac 4TB.  I have intermittent problems when I use FW800 to daisey chain these drives to my 2010 Mac Pro, OS10,6,7. Can someone suggest a solution?

PeterHT, perhaps the following article might be of some help:

Answer ID 1490: WD FireWire enabled drives can be daisy-chained to a computer system.

The power strip is likely to be the source of the issue as the External Hard Disk Drives need an optimal power source in order to allow a desirable performance.

Regards,

I have 5 MyBook Studio II Mac 4TB - often one or more will not power up unless I disconnect it from a UPS or power strip, plug it into the wall, then replace it on the UPS. 

Why? Can this be “fixed”?