Hello Eden,
Thanks for the suggestion ... I was just getting ready to do that. I had also already played around with Cable Select versus Master/Slave, an older (4200 rpm 20GB 2.5" laptop) HDD, etc ... (The laptop drive did not exhibit the error, but there were too many other variables ...)
HOWEVER ... I just dove in and purchased NasLite+ USB. With no other changes (HDD, cables, Master/Slave etc etc) IT NOW WORKS !!!
Too preliminary to tell yet ... I will run more continuous tests ... but so far no more Delayed Write Failures and MUCH MUCH BETTER performance (continuous network utilization around 85-88% in Windows Task Manager on the machine that is the source of those large folders as compared to 70% usage before with long 0% pauses).
Intermediate question though: in NASLite the "System" log had shown cumulative RX and TX bytes transfered. Now in NASLite+ USB those bytes seem to be all over the place (RX 2.3GB; five minutes later 1.0GB, then 32.5MB, etc). All this during these large transfers.
Any idea ??
(BTW: with NASLite (and the Delayed Write Failures) System log showed RX packets with errors, dropped, and overruns. See my post
http://www.serverelements.com/phpBB2/viewtopic.php?t=584&highlight=&sid=d8094372f328fffd386b888a8832fd62 All zero so far with NASLite+ after transfer of about 15GB in 3 sub-folders and 35 files total.)
Georg
UPDATE: I just copied (in a single Windows Explorer copy/paste operation) one folder with 33 files in 9 sub-folders, 12.8 GB, with NO ERRORS in 23 minutes (works out to about 9.5 MB/sec (or 76 mega-bits/sec or 76% (not counting protocol overhead) of what the cabling is rated at)).
FANTASTIC ! Total copied so far without any further errors in the past hour or so: 27.5 GB.