drive to copy off the Maxtor directory, but then decided to compress the
copy of that directory on the drive itself. I was using the rejuvenated
Pentium 4 tower with the slow USB ports.
After some data movings around, I suddenly got a shocking message:
"Delayed Write Failed" OH SH----!
What? What does that mean? Is my data safe? I get control of the drive
again. I check my directory - AAUGH! IT'S BLANK!
Ok, don't panic. This is a PC with Windows. I can get the data back. I
finally dig through the net on the 'puter downstairs and find a free
data recovery program.
As it turned out, I didn't need it. I was able to eject the drive and
restart it and my stuff was still there. However, I got that DWF error
again while just Preview viewing a 736K image, so either the drive now
has some sort of error, or there's something going on in addition to
just reading stuff. I ejected the drive Again, plugged it back in and my
stuff was still there.
So what causes Delayed Write Fail?
In my case, I'm blaming the USB controller in the P4 tower. I keep
getting told "This Device Can Perform Faster" and I know there are no
high speed USB 2.0 ports so I definitely need a new PCI USB controller
card. Sometimes the memory cache in the controller on board can get
corrupted which also contributes to this problem. This can happen during
large file transfers - but it happened the first time for me during a
large Write, then again from a Read. I might need to use CHKDSK or maybe
Defrag as well.
Some work arounds I found included using a filter driver to limit the
memory cache usage. This means slower transfers, but they're pretty slow
as it is.
Turning off Write Caching makes sense, but then you also have to turn
off System Restore Monitoring for the drive. Still makes me wonder what
it was writing to during a view of an image file...
Some people Disabled Power Management for their drive as in Never
Hibernate.
Still others had luck in using a shorter cable or watching where they
put it. Others recommended keeping the drive cool since most of these
external USB drives do not have cooling vents or fans. Others modified
the case to allow some air flow.
Then there was the registry tweak that worked for some but not others
(and in those cases, the drive disappeared from My Computer or was
inaccessible altogether - maybe they performed the tweak wrong?). There
was another program called Cacheset from Sysinternals (now owned by
Microsoft) that helped some people.
I'm likely going to hook my Maxtor to the 'puter downstairs and run
CHKDSK on it. Never had a single problem with that tower. I think I
should do with the data on there that I had planned to do with the other
P4 Tower and that was to burn some more Data CDrs.


