Text: Various hard disk drives have been produced, including options at 20, 60, 120, 250, or 320 GB. Inside, the Xbox 360 uses the triple-core IBM designed Xenon as its CPU, with each core capable of simultaneously processing two threads, and can therefore operate on up to six threads at once. Graphics processing is handled by the ATI Xenos, which has 10 MB of eDRAM. Its main memory pool is 512 MB in size.

Question: do all xbox 360 have a hard drive?
yes