Apple Computer , iMac 21.5-inch 2.5/2.7 GHz Core i5 (i5-2400S, i5-2500S), iMac 21.5-inch 2.8 GHz Core i7 (i7-2600S),
Order Number, MC309LL/A, MC812LL/A, BTO/CTO,
Model Number, A1225,
Model Year, Mid 2011,
Part Name, Hard Drive 256GB (SSD),
Manufacture Part Number, N/A,
Compatible Apple Order Number, MC309LL/A, MC812LL/A, BTO/CTO,
Compatible Apple Model Number, A1311,
EMC Number, EMC 2428,
EEE Code, DH89,
Compatible Apple Computer, iMac (21.5-inch, Mid 2011), ,
Order you product here:
661-5943 Hard Drive 256GB (SSD) for iMac 21.5-inch Mid 2011 A1225 MC309LL/A, MC812LL/A, BTO/CTO,
661-5943
source
http://info.applepartsellers.com/661-5943-661-5943-hard-drive-256gb-ssd-for-imac-21-5-inch-mid-2011-a1225-mc309ll-a-mc812ll-a-bto-cto