Bought for backup my iMac 5K this product. Because unfortunately I need a Windows XP program (via Parallels) I've maxed out my SSD with 750 GB. Therefore, the 3 GB LaCie. Data transfer is only around 190 - 200 MB / s at Thunderbolt. 2 My external SSD (Thunderbolt 1) shows but at 290 to 657 MB / s. But since I do not use the LaCie to boot, it is sufficient for the Datensichrung. If it completely with SSD, not only as a hybrid with 128 GB, these are disk I suggest probably. The product works fanless and thus quiet and has an off switch. Am satisfied.