If you have your drive formatted NTFS for the PC, the Mac will be able to read from the drive, but will not be able to write to the disc. To format it so that it will work cross-platform with both Macs and PCs, you will need to format it FAT32, and you will need to do it on a Mac, as PCs cannot format over 32GB in FAT32. Make sure you back up your data before formatting as it will destroy all data. Connect the drive to the Mac, turn it on, then open DiskUtility. You can find this in the Applications>Utilities folder. Then locate your drive on the left side of the window, and choose the drive by clicking on it. Then choose the Partition Tab. Under the volume scheme, change the drop-down menu from Current to 1 partition. Then click on the Options button and choose Master Boot Record (MBR) and click OK. Then under the Format menu, choose MS-DOS, or FAT. Then clcik Apply and OK, and the drive will format FAT32, and you will then be able to read and write cross-platform. I hope this helps.
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