Please understand that opening the case has voided your warranty.'

The solid-state drive already fitted inside is an older SATA Revision 2.0 device from SanDisk, the Ultra 120 in our example.

Given Thunderbolt's design specification of up to 10Gbps full-duplex (that is, 10Gbps in each direction simultaneously), which is equivalent to 1250MBps, there ought to be bandwidth to spare to use a third-generation SSD that is capable of at least 500MBps sequential read/write speeds.

The SanDisk Ultra 120 SSD itself is limited to around 280MBps performance.

We were told that this older, slower drive was selected due to restrictions imposed on the power budget.