Advertisements The Western Digital drive is "OEM style" only coming with an antistatic bag while the Seagate unit is full retail boxed. If you have an S3 the Seagate could be a good choice for an internal upgrade. Frys part #5433109 for the Western Digital 1TB OEM http://shop1.outpost.com/product/5433109 Available online or in store for 229$ Frys part #5478279 for the Seagate Retail Boxed http://shop1.outpost.com/product/5478279 Available in store for 234, website doesn't show new price (perhaps tomorrow?) I purchased the Seagate drive tonight for the extra 5$ since it had double the onboard cache and included cables (SATA and power converter). I confirmed they had 19 WD drives in stock and they seemed to have at least that many of the Seagate at the Palo Alto store.