I understand there's the obvious speculative answer of "Well something else relating specifically to Target Disk Mode is obviously bottle-necking it." Ok. Does anyone know why Target Disk Mode is so slow? What on earth is going on? Thunderbolt 3 in real world tests with any other fast enough drive is capable of at least about 2800 MB/s. Then the reverse: Booting the MBP from its internal drive and then connecting the iMP in Target Disk Mode, testing the iMP (Target Disk) I get read & write speeds of about 200 & 250 MB/s respectively!! Now, in separate tests, I connect each to the other in Target Disk Mode over Thunderbolt 3 (using a short 1 foot cable so as not to lose the maximum 40Gb/s speed).īooting the iMP from its internal drive and then connecting the MBP in Target Disk Mode, testing the MBP (Target Disk) I get read & write speeds of about 450 & 700 MB/s respectively. Using the iMP standalone, the internal drive gives me read & write speeds of about 2500 & 2900 MB/s respectively. Using the MBP standalone, the internal drive gives me read & write speeds of about 2600 & 2000 MB/s respectively.
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