Here's another discussion of the problem with this Seagate drive:

http://www.mac-forums.com/forums/apple-n...e-momentus.html

They seem to like the Western Digital Black, if it's still available.

This is the model number on the Seagate in my MBP, I wanted the 7200rpm drive: ST9500420ASG

The G at the end means it has the G Shock protection which conflicts with the Mac's Sudden Motion Sensor. Whether that is what is causing the directory problems or not, I don't think the drive should be replaced with the same model because if it is the problem it will happen again when it isn't under warranty! Like I said, I have time to make a decision.

Mid 2010 MacBook Pro 13"
2.4GHz, 750GB SATA HD, 8 GB RAM, OS 10.7.5
1 HDX1500 2TB Ext.HD, 2 HDX1500 1TB Ext.HD
HP Laserjet 6MP printing postscript via 10/100 Intel print server
Netgear WN2500RP Range Extender (Ira rocks!)
Linksys WRT1900AC Wireless Router
Brother MFC-9340CDW Color Laser
iPad Air