WARNING: Formatting will erase all data on the device. Back up all your data before proceeding.

Mac Os Format Disk
Formatting A Disk Drive
Best Disk Format For Mac

Instructions below are for 10.11.x (El Capitan) and 10.12.x (Sierra)

Using FAT File System Format for Mac & Windows Compatibility. Once the drive is formatted it will be compatible to be read and written to on both a Mac and PC. Simply connecting the formatted drive to a Mac or PC will allow the drive to be used on either operating system, so you can access and transfer files as needed. You might already know the consequences of formatting a hard drive. It will erase all the data stored in it, making it empty in one go. Therefore, before you format Mac/PC drive, make sure that you have taken a backup of your important data. Once it is done, you can do a hard disk format for Mac and PC to enjoy the following advantages.

1. Double-click on Macintosh HD - or in the Finder menu clickFile > New Finder Window
2. Click the Applications folder - if using a Finder Window Applicationswill be in the left side menu.
3. Click the Utilities folder.
4. Double-click Disk Utility.
5. On the left side of the window are the drives connected to the computer. Select the capacity of the drive respective to the one containing the device you wish to format then click the Erase tab.
Example: If the drive is called 'NO NAME', directly above that, you should see the drive capacity of 'XXXX'. Select this capacity.
6. Verify Volume Format is set to MS-DOS file system or exFAT, Scheme is set to “Master Boot Record” (Do NOT select GUID Partition Map) then click Erase.

Instructions below are for 10.13.x (High Sierra)

1. Open Disk Utility. Please See Answer 20985: How to access Disk Utility macOS
2. In the top menu bar, go to View, and choose Show All Devices

3. Select the upper level of the drive you would like to format and click the Erase button

4. Choose how you would like to format the drive

Mac Os Format Disk

Enter a Name for your drive
Choose exFAT or MS-DOS (FAT) for the format
Choose Master Boot Record for the Scheme
Click Erase

5. When finished, the drive will be formatted and repartitioned successfully. Click the Done button

NOTE: exFAT is used on SDXC card (64GB and higher).

NOTE: exFAT can be used on flash drives or memory cards to transfer files larger than 4GB.

NOTE: MacOS 10.6.2 or higher is required for exFAT file system. Some older operating systems must have a patch installed before they can use the exFAT file system.

NOTE: If the above steps do NOT resolve the problem or if the lock switch is missing or broken, please back up your data and request a replacement using our online web form.

Related Articles:
Operating systems that support exFAT
Deleting files on a memory card using a Mac
Deleting files on a Cruzer USB flash drive using a Mac

Updated on October 23rd, 2020

This article shows you how to format an external hard drive via different methods, and you can follow these methods to format external hard drive for PC, Mac or Linux.

External hard drive is popular storage device and it can be used to store all kinds of digital information such as images, documents, apps, emails, etc. You can connect external hard drive to computer via USB cable and then transfer data with internal hard drive. Regardless of the brand or model, the first thing you may need to do after purchasing an external hard drive might be partitioning and formatting it.

Formatting external disk can be done via various methods and it can be formatted to a range of file system so that you can use the disk under different operating system platforms. The formatting process removes all data on the partition and thus causes data loss. You should create a backup for important data before formatting if the disk contains significant files.

A brand-new external hard drive is usually partitioned into s single partition with NTFS file system. Still many users would like to format the external hard drives and people do that due to various reasons:

Format external hard drive to required file system. The brand-new disk you purchase might not be formatted to the file system type you need. To change file system type, formatting should be done.
To quickly remove content from external hard drive. Quick formatting is able to format a partition within seconds, and all data on the volume will be deleted. This is a good solution to delete data and free up disk space.
To optimization performance for disk. Formatting can clear data fragmentation quickly and easily.
Remove virus or malware. Since external hard drive might be used on many computers, it tends to infect virus. Many users would format it to clear virus and avoid more damages.
To fix file system errors. Sometimes external hard drive may become RAW or reports errors like “The file or directory is corrupted and unreadable”, you can fix these errors by formatting the volume after file recovery.

Step 1: Connect your external hard drive with your computer and open Windows Explorer to check if it can be recognized.

Note: if you have stored data to the drive, please back it up before formatting the disk.

Step 2: Right-click on the external hard disk and select “Format” option from context menu.

Step 3: On the formatting window, select Quick Format option, choose file system format, and click Start. Also you can enter a name for the drive under Volume Label.

Step 4: System prompts formatting removes all data and asks confirmation for the action. Click OK and formatting starts.

This method formats external hard drive using Windows built-in utility Disk Management. If your external hard drive does not show up in Windows Explorer, you can follow this instruction to complete the formatting.

Step 1: Access Windows 10 Disk Management by right-clicking Start menu and selecting “Disk Management” item from the list.

Step 2: Locate the external hard drive in Disk Management and check its status.

If there is not partition on the disk or the disk is marked with Not Initialized, you cannot format it directly.

The next step assumes the external hard drive is full of unallocated space and shows how to format it.

Step 3: Right-click on unallocated disk space and select New Simple Volume from the context menu.

Step 4: You can see the “Welcome to the New Simple Volume Wizard” now. Click Next button to proceed.

Step 5: The wizard will ask you to select set partition size, drive letter, file system, format method, etc. step by step. You can follow suggested option to complete the process.

Want to use external hard drive under both Windows PC and Mac? In this case, you should consider the hurdle that these operating systems support different filesystems. The default file system in Windows is NTFS, while Mac OS users HFS. The filesystem that is compatible with Windows and Mac is exFAT and FAT32.

exFAT VS FAT32, which one should be chosen for Max and PC? It is recommended to use exFAT by many experts, because FAT32 has a maximum 4GB file size limit and exFAT does not has such limitation, and exFAT also performs better than FAT32. FAT32 is also a good choice if you do not store files whose single size does not exceed 4GB.

FAT32 and exFAT file system is supported by Windows though, they are originally designed for removable storage devices like USB flash drive, SD card. When you try to format an external hard drive which has very large capacity in Windows, FAT32 or exFAT may not be available. Also, some users may encounter error “The volume is too big for FAT32”. In this section, we’ll use a free Windows partition

Formatting A Disk For Mac