[X4U] problem copying external HD to external HD

[Doug Metzler]

Hello,
I am trying to consolidate the contents of several smaller external HDs
onto
an external 2T drive and am having a strange "memory leak" sort of problem.

The process is filling many GBs of the internal drives of the two Macs I
have
tried this with.  Details: source HD is an old firewire 400 Lacie
120G drive,
destination is Western Digital usb 2 drive formated for 32 fat, two
computers
are an iMac 2.4GHz Core 2 Duo and a 17 inch MBP with same chip, both
 run 10.5.8.  For instance, I am now transferring a 78G folder and have
transferred 7.7G of it, but the available space on the internal iMac drive
has
gone from 236G to only 192G!  Something is taking up far more space on
the internal drive than has been actually transferred between the two
externals.  I could imagine that an internal directory pointing to the
contents of the external drives might be expanding but how could
that be larger than the actual files?  The additional space is returned
on a restart but I don't know anyway to free it up short of that.
Any thoughts or help would be appreciated.
Doug
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