Which is the derivative of -LSB- math -RSB- d \ frac -LCB- \ ln -LRB- y-1 -RRB- -RCB- -LCB- \ ln -LRB- y -RRB- -RCB- \ over dy -LSB- / math -RSB- ?
What is the difference between PCle based flash storage and SSD on a Macbook Pro ?