Will changing HDD get rid of backwards compatibility?

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I have an original launch 40gb PS3 that plays PS2 discs. The HDD is too small to play some games so I want to be able to upgrade it to a larger disk. If I replace the hard drive on my PS3 will it erase the stuff that lets me play PS2 games?

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The original 60gb ps3 used hardware emulation and it was removed and switched to software emulation for the 40 and 80GB models. The software that does this emulation is part of the operating system and this is not on the Hard drive. Replacing the hard drive will not get rid of backwards compatibility, so you are free to swap it with a larger drive if you wish.