External hard drive not showing up in finder

Hi,
I have a LaCie Rikiki USB 3.0 1TB external hard drive for more than a year or so (probably longer than that). The hard drive has 2 partitions with one formatted as Mac OS Extended (Journaled) <named MAC> and the other MS-DOS (FAT) for windows <named as FOR WIN>.
The MAC volume has been working fine yesterday then suddenly it just started to transfer files very slowly and had problems unmounting when I am done transferring files saying it is in used by an application when it is not. So I had to force eject the the MAC volume while the FOR WIN volume ejected fine. However, here comes the problem.
Once I reconnected the external hard drive, it does show up in disk utility but not in finder. Also, the FOR WIN volume showed up as disk1s2 in disk utility. I tried using disk utility's verify and repair disk and couldn't fix the FOR WIN volume so I gave up on that since I don't have any important files in that volume. On the other hand, I could run verify and repair to get the MAC volume mounted. Through that I could get some files copied but soon finder hangs on me and wouldn't open even after relaunch which led me to disconnect the drive by just unplugging the USB. Now when I connect the drive, it again shows up in disk utility but not mounted and when I try to use the verify and repair all I get is:
Verifying Volume "MAC"
checking file system
Error: This disk needs to be repaired. Click Repair Disk.
Verify and Repair volume "MAC"
Checking file system
Volume repair complete
Updating boot support partitions for the volume as required
and it's stuck at "updating boot support........" I've let it ran for like 6 hours and it's still at that stage. Had enough, closed disk utility and reconnected the harddrive and it's still the same showing up in disk utility but not mounting.
Could anyone please help? Thank you!

tonydenson wrote:
That's great thanks. cmd-shift-c brings it back.
then it should also show up on the desktop. go to finder preferences->general and check the boxes to show external and CD drives.
Incidentally, I now have the opposite problem, I can't eject it. I get the message that the disk is in use, try quitting applications. I quite often get this with mounted drives or flash drives. Is there any way of finding out which particular application has a given device open ?
sometimes spotlight keeps drives busy.
you can see what's doing it by running the following terminal command
sudo lsof /volumes/lacie

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