The disk drive in ComputerCraft had the numeric ID of 166 which later became barriers. ComputerCraft was bundled in the MinecraftEdu mod that Mojang bought the right to in MinecraftEdu 1.7.10 Build 20 ^{}and remained in MinecraftEdu until the last version 1.8.9 Build 3. However, in 1.8.9 Build 1 and later the barrier is stored using the alphanumeric ID instead of the numeric ID meaning the 166 ID disk drive is only obtainable from MinecraftEdu 1.7.10 Build 20 to 1.7.10 Build 22. If this item is updated to a version after the barrier was added, 14w05a (1.8 snapshot) or later, it will convert.