Reformatting an external hard drive without losing data is a delicate process, but it can be done safely with the right steps and tools. Here’s a step-by-step guide to help you through the process.

How to reformat an Ext4 drive in Windows 10 The first step is having the right tool for the job. In this case, we're using a piece of software called DiskGenius, which can be used for free.

While the Mac can use a hard drive formatted for Windows, some features may be limited. So it's a good idea to format a new hard drive specifically for macOS.