Western Digital 320 GB Scorpio Black SATA 3 Gb/s 7200 RPM 16 MB Cache Bulk/OEM Notebook Hard Drive - WD3200BEKT

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"Free-fall sensor - As an added layer of protection, if the drive (or the system it's in) is dropped while in use, WD's free-fall sensor detects that the drive is falling and, in less than 200 milliseconds, parks the head to help prevent damage and data loss."

Model: WD3200BJKT HAS this sensor and is a little more expensive. Worth it , In my opinion.

Model: WD3200BEKT does NOT have this sensor. Retailers are not very clear about this.

I installed this in my C2D 2.16Ghz MacBook Pro yesterday and couldn't be happier. The size has freed me from continual file cleaning and the speed increase is noticeable. There is a slight bit more noise from the drive, but is sounds like a white noise generator, a gentle hiss/hum, nothing to worry about and I am picky. There is no clacking or anything truly noticeable, definitely no heat issues.

As far as some of the comments people have posted regarding noise I would recommend anyone who has noise problems after the install check the rubber grommet mounts. If you don't get them back in place properly the mounts can't do their job and the noise will resonate thru the sounding box that is the MacBook Pro. As far as heat issues I would guess the user didn't check the cooling fans. I pulled my fans while I had it open and found each heatsink 1/3 covered in a cake of dust. I cleaned them and now the whole thing runs cooler.

NOTE: Do not get the WD3200BJKT...Read more

I replaced the original hard drive on my first generation MacBook with this one. Worked like a charm. No problem whatsoever. Boot time significantly improved. Plus four times the space.