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.
Charlene253 is absolutely correct. If the drive was formatted with Windows (NTFS or exFat) then it won't be recognized by the Mac. If you are running Windows 7 or 8 you will need to format the drive using the Mac as Windows will not format a drive over 32GB (that is 32GB is the largest partition that Windows 7 will allow) using FAT32. Once you format it on the Mac (using the MS-DOS (FAT) option) you should be able to use the drive on both the Mac and PC. As Charlene253 suggested you should back up all critical files first.