i have a toshiba 1TB desktop external hard drive and i could use it on my windows OS laptop but i bought a new a mac book and i cannot use this external hard drive on it. It does not pop up when i connect to mac. And also i have enable the check "show external drives " in preference in mac but still nothing happens when i connect HD to my mac. The HD starts working but does not show up on mac. Whats the solution of it ? please answer me i will be very thankful to you because i have very important data in it.