We just got a call from one of our customers in the UK. He tells me that all the CORE packs he bought today had the Toshiba DVD Drives and all the Premium packs he bought had the Hitachi DVD Drives. So our recommendation if you are looking to get a Toshiba drive is to get a new core pack.
If you need to identify Xbox 360 DVDROM you have in your new 360 console please see this tutorial here.. It will let you identify your dvdrom drive without opening your console. Just take a look at the images shown.. Its very easy to distinguish what drive you have so go check it out..