acronis true image wd edition - won't resize from 900mg to 2000mg

howdy y'all,

specs ...
os = win7 fully patched
ati-wde = 2010 build 14.010
source drive = wd1002faex-00z3a0 [c:, boot & hidden win7 system]
target drive = wd20eads-22r6b0 [tested, works in win7 quite nicely]

problem ...
if i choose to set the target partition size as either "PROPORTIONAL" or "MANUAL" [what i really want to do] the program fails with the following error ...
"
failed to move the selected data. make sure that your new drive is no smaller than your old one and your partitions do not contain errors. you can check for the errors and correct them with a special utility.
"
[please see attached screen shot of error msg]

note that the danged error msg text CANNOT be copy/pasted. [*sigh ...*]
note that the "special utility" is not identified in any way. [*frown*]

i've tested the target drive. used win7 to partition, format & copy 200 gigs of data to it. the drive appears to be FINE. i've tried ati-wde with the target partition removed, too.

interestingly, if i choose to set the target size to "AS IS" ati-wde will accept that. [*sigh ...*] again ...

this entire exercise is cuz ati-wde resized the hidden boot partition [what is that _properly_ called?] when i moved from a slow 2tb drive to the new, fast 1tb drive. now that partition is 48mg and windows backup chokes since there is not enuf space on that partition to prep the backup. yes, i know i can use other stuff to backup - ati-wde for instance [*grin*] - but i don't want an unneeded glitch sitting around waiting to bite me! i am a _devout_ believer in murphy.

the point is to resize the hidden partition to the original 100mg size & get it back on the nice, fast wd1002faex.

help? please?

take care,
lee