I've been reading the thread about backing up hard drives with
interest.  I have a similar question. 

I have a 4 TB external USB hard drive that I've been doing backups on.
 Unfortunately, it's starting to get a little flaky -- not being
recognized by my laptop, etc.  The problem got better when I changed
enclosures, but now I'm a little paranoid that it might continue to
degrade.  So... I'd like to copy the data to a new USB external hard
drive.

The drive is about 96% full.

I have tried plugging the old drive into a USB port, plugging the new
drive into a USB port and simply doing a cp -Ruav from one to the
other.  It goes gangbusters for awhile, but after about 5 or 10 gigs,
it slows down to almost nothing.  At the end of 8 hours of copying,
it's plugging along, but I only have about 400 gigs copied.

I've searched the intertubes, and it seems that this is a problem
people have asked about across multiple distros.  It is apparently
associated with some sort of cacheing issue in the kernel. 

Is there some solution to this?  I tried rsync, but it was even slower.
 I haven't tried dd, which was mentioned in the other thread; I might
give it a shot this weekend.  But if there's a known fix for this, I'd
love to  hear it.

Thanks,

billo
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