External HDD: Shows not ejected properly when the drive is still present

Hi,
I have a Seagate 500 GB external HD, the big one with power adapter. I connect to my MBP with a USB cable. Recently, every now and then, I am seeing the message "Your external disk was not ejected properly. Always make sure you eject blah blah..." even when the disk is firmly planted onto the Mac. I can see the disk in my desktop and finder. But keep getting this message nevertheless.
Another observation is - If I have Picasa open, Picasa fails to load the pictures in the external HDD when this happens. Pictures that has been earlier added to Picasa library, that is, which should ideally show up when the HDD is connected.
Any ideas?

Try a different USB cable. If that doesn't work, go to Seagate's web site and open a tech support request with them. If a new USB cable doesn't help, there is probably a problem with that disk drive such as outdated firmware.

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