EMMC

There are various eMMCs used on the Xbox 360. They hold the Xbox System Software, SMC, other system files, and contain a memory unit. They are all 32Gbit (4GB) chips.

Hynix H26M31001FPR

Used on Waitsburg motherboards in the 4GB SKU.

SK Hynix H26M31002GPR

Used on Stingray motherboards in the 4GB SKU.

SK Hynix H26M31001HPR

Used on Winchester motherboards in the 4GB SKU.

Toshiba THGBM5G5A1JBAIR

Used on Stingray motherboards in the 4GB SKU.