ADATA’s current lineup of 2.5-inch solid state drives are 9.5mm thick. While this does conform to the standard many new devices like slim laptops and ultrabooks require drives to be only 7mm thick. ADATA has now reduced the size of their 2.5-inch solid state drive lineup to 7mm. This way you can use ADATA drives in these devices. These new 7mm drives will ship with plastic holders so they can still be placed in 9.5mm slots.
Source: ADATA | News Archive