Formatting is necessary to operate a hard drive that doesn’t have a file system. There is also no getting around the formatting of a hard drive if you are planning to change file systems. If you plan on switching from the file system FAT32 to NTFS, you will be able to save large files over 4GB on a hard drive and benefit from increased data security, amongst other things.
You may consider switching from NFTS to FAT32 if you want greater mobility and the best possible cross-platform compatibility during data exchange. FAT32 hard drives can be read by most hardware in the home, such as media receivers or smart TVs. A smooth cross-platform data exchange is guaranteed as Apple’s Mac computers can handle the FAT32 formatting of external hard drives without any additional tools.
A freshly formatted hard drive is also a good basis for a new installation of an operating system that is guaranteed to be virus-free and run smoothly. You can also opt for a completely new installation, including the formatting of the system hard drive, during an upgrade, e. g., from Windows 7 to Windows 10.
With regards to data security, formatting is only recommended to a limited extent. Special software can, under certain circumstances, restore data that normal users can no longer see or find due to the formatting. If you want to sell a used hard drive that still contains sensitive data (e.g., confidential customer and online banking data), you should use special deletion tools. They overwrite data multiple times and comply with generally binding security standards.
You can use standard Windows tools to format internal and external hard drives. The individual steps are explained using Windows 10 as an example but are very similar in Windows 7 and 8. If you want to find out about the most common file systems for formatting disks, look at our file systems overview which contains all the information you need to know.