Launch Disk Utility.
Step 2. Step 3. Select the storage drive from the sidebar of Disk Utility.
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Click the Erase tab from the top. Step 4. Enter the name of the storage drive alongside Name. Finally, click the Erase button.
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Step 5. When the erase operation is successful, click Done. You can transfer files from Mac to PC or vice versa without any issue. Hence, if the storage drive contains any critical data, then back up those data to another storage drive before performing the erase operation to avoid losing your data permanently.
How to Convert a Macintosh Hard Drive to Fat 32
R EMEDY : If you have not backed up your external USB storage drive data and erased the drive in a hurry, then you must stop using the external drive immediately to avoid overwriting. Recover your data using the backup; else consider a data recovery software on your MacBook or any Mac system you own. The choice of one over the other depends upon your need.
If you do not use, create, or transfer files larger than 4 GB then formatting your external USB storage device in FAT32 file system format is satisfactory. Here's how. You can format the drive from either the Mac or the Windows machine.
Before you continue...
However, if you want to use part of the drive for OS X's Time Machine backups, you should do this from the Mac, since there's an extra step to make the drive compatible for Time Machine. Open Disk Utility. The easiest way to do that is hit CMD and the spacebar at the same time and type in Disk Utility to find the program. If you don't plan on using the drive for Time Machine, skip steps 5 to 11 below and continue with step Enter the amount of space you want to set aside for Time Machine.