I've had the Seagate Expansion for close to a year and it works great. It replaced an older Seagate Portable Expansion Drive (one that was twice as thick) whose USB connecter plug got loose. I removed that drive from the enclosure, and am using it in a dock, despite the fact that it's 13 mm wide. I suspect that the new Seagate Expansion is 9.5 MM wide or perhaps even less.
As for the WD Passport drives, the 2 GB drive that I own is much thicker than the Seagate Expansion drive. I've read that the Passport drives use a proprietary interface, and cannot be used as laptop replacement drives.
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