When you first attach a new external hard drive to your Mac, it should mount and be ready to use; however, before relying on it, consider first taking a couple of precautionary steps to ensure that the drive continues to work as expected.
One of the first things to take into account is that the drive is likely preformatted to FAT32 instead of a more OS-specific format. Since FAT32 is readable and writable on both Windows and OS X systems, this is quickest way for a drive to work on each platform; however, it does have some limitations, including the lack of journaling support that would help prevent data corruption, and lack of support for filesystem permissions. In addition, FAT32 drives usually come with the Master Boot Record partition scheme, which does not work with Apple's CoreStorage routines, and therefore will not allow OS-supported encryption of the drive (among other customizations).
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One of the first things to take into account is that the drive is likely preformatted to FAT32 instead of a more OS-specific format. Since FAT32 is readable and writable on both Windows and OS X systems, this is quickest way for a drive to work on each platform; however, it does have some limitations, including the lack of journaling support that would help prevent data corruption, and lack of support for filesystem permissions. In addition, FAT32 drives usually come with the Master Boot Record partition scheme, which does not work with Apple's CoreStorage routines, and therefore will not allow OS-supported encryption of the drive (among other customizations).
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