If you have both Windows and Mac computers in your office, it's important to understand their different storage requirements before buying an external hard drive. Both operating systems use different formats for reading and writing to a hard drive. The only hard drive format that can be reliably used by both is called FAT32, or MS-DOS FAT as it's called on Mac computers. Media hub for mac. Even if your external hard drive doesn't come pre-formatted in FAT32, you can format it yourself using either a Mac or Windows PC.

FAT32 is old, like Windows 95 old. Originally created to replace FAT16 (File Allocation Table), it has since been used because it is compatible with modern and older systems.

Other Formats External hard drives formatted specifically for Windows usually use NTFS. Mac OS X can read NTFS drives but can't write to them. Unlike FAT32, NTFS supports Windows file permissions and is more stable. External hard drives designed specifically for Mac computers are usually formatted in HFS+. There are tools available online that allow you to write to NTFS from Mac OS X and tools that allow you to write to HFS+ from a Windows computer, but these tools can be difficult to manage and require some technical expertise. Microsoft's successor to FAT32, exFAT, is compatible with recent versions of Windows and Mac OS and removes the 4GB limitation, but brings its own set of trade-offs (see Resources). Formatting From a Mac If you want to format a blank external drive from a Mac computer, launch the Disk Utility, located in the Applications Utility folder.

After you select the drive, click the 'Erase' button at the top of the window, and then select 'MS-DOS (FAT)' from the Format menu. If you want to only format a portion of the hard drive, click the 'Partition' button and then use the controls to select a partition size and which format you prefer. If you select a Mac OS format for the partition, it won't be readable from a WIndows PC. Formatting From a PC To format a blank drive from a PC, you can use the Windows 8 Disk Management Utility. To open this utility, right-click the bottom-left corner of the desktop and select 'Disk Management' from the menu.

After you locate the drive in the list on the left, right-click its name, select 'Format' and then select 'FAT32' from the File System menu. To format only a part of the drive, create a new partition on the drive, right-click the drive name and select 'New Simple Volume.' The New Simple Volume Wizard opens to guide you through the process.

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Any partition you make that is not in FAT32 is visible from a Mac computer, but the Mac can't write to it.