MyBook freezes and locks up iMac

Hello. My external HD (MyBook connected via USB 2.0) is freezing and locks up my iMac. I get the pinwheel and it requires a hard reboot -- not ideal. It seems to happen after waking from sleep. Any reason why this is happening and ideas on how it can be fixed?
Message was edited by: EnergonCube

JAS hello,
sounds like you may have some file issues that need
addressing....
Shut down and restart your computer with the Command
key and the letter 's' depressed.
At the prompt type or copy and paste (don't forget
the space)
/sbin/fsck -fy
hit return key and wait for all clear to be displayed
then type.
reboot
hit return key
Check the pemissions are set
correct on the Apple installed software...
use 'Disk Utility' from Applications > Utilities >
select HD... select 1st aid. repair permissions...
if repairs are needed run again until none are
repaired... do not worry about messages 'we are
using special permissions etc... they are OK Quit
when finished.   
Use
BatChmod to set correct permissions on your home
~ Music folder
This compact GUI will perform the same tasks as a
'terminal command line'
drag the complete Music folder with libraries
and iTunes Music folder inside to the BatChmod Icon
and drop....
check path is correct.... tick if not already....
Owner=R W X, Group=R, Others=R,
then tick 'Apply ownership and privileges' tick
'Unlock" ... click Apply...
provide password... all done very quick...
come back and let me know how it all goes now ... TP
iMac 800MHz PowerPC G4
17 Flat Screen. G4 iBook.   Mac OS X (10.4.3)  
TP:
I got everything done except the BatCHmod. I'm not familiar with this command and I don't know where the icon is - please provide more specific information.
Thanks,
JAS

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    Owner=R W X, Group=R, Others=R,
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    iMac 800MHz PowerPC G4
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