Hi, I am not using a MyBook drive, but instead a 1TB seagate inside a Tacens Vecto USB/eSATA enclosure, and for what it is worth, just tell you that :
- Regarding the cable, I've had no problem so as you suspect yours should be very well a specific MyBook case problem.
- Regarding SMART, eSATA is nothing more that the same old SATA interface with a more shielded rigid cable, so it *tends* to be a lot more friendly and supportive for enhanced drive features than USB. This includes reporting of SMART and / or allowing specific HDD features such as AAM, setting of protected areas,.. etc. Seems really strange that you can not read drive temps.
- Talking about temps, I would not get concerned unless you can really prove/see that the drive gets hot/hotter than 45-50 ÂºC in operation. Even in that case it is normally possible to improve heat dissipation by doing some modding or as you say, placing the drive with a fan pointing to it, laying a heatsink on top, or just simply make it rest on top of a cold surface.
- Regarding performance, your numbers look right.