HT2494 external harddrive not recognized

I'm running OS 10.6.8 with a maxtor one touch 4 ext harddrive via USB. I have MacDrive 7 on my PC & I use this to transfer files back & forth from PC to Mac. This morning, I unhooked the drive from the Mac and forgot to drag it to the trash can on the desktop first. It worked fine when I hooked it up to the PC and I moved the files onto the drive. But now, the Mac won't recognize the maxtor, even after I reboot; even after I shut down and unplug everything and walk away for 10 minutes. What do I do?

Anyone?

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