I've had this 750 GB external drive for a year or two now, and have used it with no problems. All of a sudden, it can't be read by my MacBook. Finder can't see it. No applications can see it except Disk Utility. But DU can't repair it, and when I try verifying I just get "Verify volume failed: Invalid request." Also, when I'm using DU normally, I can't even eject the drive. But if I boot from my Mac disc, I can. But that's the only difference; still no repairing or verifying, and I get the same error message. I have a bunch of stuff on the drive and would really like to get back to it, anybody got any ideas? I'm fairly savvy but wouldn't trust myself with command-line anything. Thanks.