Note: without memory stickProduct OverviewThis Thunderbolt 2 SSD enclosure is a high-performance storage expansion solution designed specifically for 20112015 iMac models. It is also widely compatible with all Mac computers equipped with Thunderbolt 1 and Thunderbolt 2 ports, providing users with a convenient and efficient storage upgrade option.Product AdvantagesPlug-and-Play: Features advanced plug-and-play technology for easy operation, allowing users to start using it quickly without complex installation procedures.No Disassembly Required: Compatible with mainstream M.2 NVMe SSDs (2230, 2242, 2280). Upgrading your storage does not require opening your iMac, significantly improving data read/write speeds and overall performance. However, the operating system must be installed on the external SSD, reducing the risk of hardware damage from disassembly.Wide Compatibility: Works with all Mac models equipped with Thunderbolt 1 and Thunderbolt 2 ports, including MacBook Air, MacBook Pro, iMac, Mac Mini, and Mac Pro.Technical SpecificationsParameter SpecificationInterface Type Thunderbolt 2 (compatible with Thunderbolt 1)Transmission ProtocolPCIe 3.0/4.0Supported SSD Type M.2 NVMe SSD (2230, 2242, 2280)Maximum Transfer Speed 20Gbps (theoretical)Actual Read/Write Speed 850MB/s+ (varies by Mac model)System Requirements macOS 10.13 or lateriMac Storage Speed Reference (Mid 2011 Mid 2015)Internal HDD: ~100200MB/sInternal 2.5-inch SSD: ~250500MB/sApple Original SSD: ~250700MB/sExternal USB 3.0 SSD: ~250450MB/sExternal Thunderbolt 2 SSD: Up to 857MB/s (tested on Late 2015 iMac A1419, actual performance may vary depending on device and testing conditions)Compatible DevicesMacBook Air11-inch A1370 (Mid 2011) EMC: 247113-inch A1369 (Mid 2011) EMC: 246911-inch A1465 (Mid 2012 Early 2015) EMC: 2558, 2631, 292413-inch A1466 (Mid 2012 2017) EMC: 2559, 2632, 2925, 3178MacBook Pro13-inch A1278 (Early 2011 Mid 2012) EMC: 2419, 2555, 255415-inch A1286 (Early 2011 Mid 2012) EMC: 2353, 2417, 2563, 255613-inch Retina A1425 & A1502 (Late 2012 Early 2015) EMC: 2557, 2672, 2678, 2875, 283515-inch Retina A1398 (Mid 2012 Mid 2015) EMC: 2512, 2673, 2674, 2745, 2876, 2881, 2909, 2910iMac21.5-inch A1311 (Mid 2011) EMC: 242827-inch A1312 (Mid 2011) EMC: 242921.5-inch A1418 (Late 2012 Late 2015) EMC: 2544, 2638, 2805, 2889, 283327-inch A1419 (Late 2012 Late 2015) EMC: 2546, 2639, 2806, 2834Mac MiniA1347 (Mid 2011 Late 2014) EMC: 2442, 2570, 2840Mac ProA1481 (Late 2013) EMC: 2630Troubleshooting GuideAll Thunderbolt 2 SSD enclosures are tested with an SSD installed before shipping to ensure proper functionality. If your device is not recognized, follow these steps:Check macOS Version: Ensure that your macOS version is 10.13 or later. If it& 39;s lower, update your system.Reconnect the Cable: Thunderbolt ports may accumulate dust or oxidize over time. Try unplugging and reconnecting multiple times or using a different port.