[edoras]

I noticed that after unmount (eject) the external drive, I don't know how to mount the drive back.
What I have to do is to reboot the mac to mount the external firewire drive back.

Is there any better way?

[Sherman Homan]

It should automagically remount when you plug it back in. Is that not happening? If you eject it, then decide you want it back, use Disk Utility to manually re-mount it.

[Koralatov]

Originally Posted by edoras 

I noticed that after unmount (eject) the external drive, I don't know how to mount the drive back.
What I have to do is to reboot the mac to mount the external firewire drive back.

Is there any better way?

The way I do it is turn it off, then turn it back on. That way, it remounts automatically without having to disconnect it or reboot. I imagine it should do the same for you. If not, something must be wrong.

[edoras]

Actually when I have unmount/eject the drive, I usually switch it off. I disconnect my macbook and went to office.

Later when I came arrive home, I will connect the macbook (which is already on) and switch on the firewire drive back, it this case, it did not "see" or "recognize" the drive. Is this normal?

Or is "normal" for me to "switch off" the drive after unmount?

[analogika]

Is it a Porsche design LaCie drive?

Those need to be unplugged and re-plugged.

[Sherman Homan]

Plugged hot into the Mac, or powered on while connected, either way it should mount. You should backup whatever you need on it, reformat it, and see if that fixes it. If not, you need to trouble shoot if it is your Mac's Firewire bus of if this device behaves this badly on another Mac.

[edoras]

I'm using MyBook Western Digital 500 GB.

[Mr_E]

Open disk utility - the drive will show, but be grayed out.
Select it - click "mount" on the toobar.

Works for me on any disk I eject, but don't (obviously) power off.

[edoras]

Thanks guys!