Downloading from one ps3 to new ps3
Is there a way to download your data from one ps3 to another ps3
Or a USB key. If you have an older PS3, the memory card slots can do this also.
However moving the PS3 HDD from one PS3 to another is possible, it WILL NOT do what you want. The new PS3 ALWAYS insists on a format of the new drive prior to using it, erasing all of the data you are trying to save.