FRUSTRATED! Cannot access Seagate external HDD - message is "the disk you inserted was not readable by this computer"

I get the message "the disk you inserted was not readable by this computer" when trying to access my Seagate external HDD.
Disk Utility lists both the Seagate drive and volume but all options (verify disk, repair disk) are greyed out.
It says the volume is unmounted and Windows_FAT_32.
(The external HDD used to be formatted for NTFS, but when I moved across to Apple last year, I reformatted to FAT32).
I haven't accessed the drive for a few months but the last time I did, it worked fine.
I'm running OS X 10.9.5 on MBA bought last year.
I've spent 2 hours trawling through blogs/mac forums/apple support and nearly bought Disk Warrior out of frustration, but surely there must be a simpler solution?
I don't think I'm dealing with a corrupt drive, just an inaccessible one!
Any help greatly appreciated, even if it is to pay the $$$ for DW...!
Thanks, Jay

See mount section in 1st link.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

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    Steve, the original poster made clear he was on a core duo iMAC which ONLY runs OS X (discounting non Apple OSes of course!)
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  • External HDD: "The disk you inserted was not readable by this computer"

    Hi,
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    Message was edited by: Nilfisken

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