Nov 28, 2017 - It is very simple to format USB flash drive on Windows PC. However, it is not easy to format the USB flash drive under Mac OS. Actually, if we.
Assuming Vista or 7 (this should work on XP, 8, 8.1, and 10, as well) and that the disk is not showing up under My Computer at all: • Connect your disk. • Run cmd as an Administrator. • Run diskpart.exe. If you need help in this program. • list disk • Find the disk that corresponds to your USB disk. Select disk n where n is the number of the disk. Confirm that you're using the right disk with detail disk.
• clean (Warning: This command erases the disk's partition information. Any data on the disk will no longer be accessible.) • create partition primary. No size is needed if you want to use the whole disk • active. Marks the partition as potentially bootable. • format fs=fat32 quick. You can choose NTFS or exFAT instead of FAT32 if you want. (Note: Windows 10 limits FAT32 to 4GB.
I recommend using exFAT instead, which is essentially a newer version of the same format.) • assign. Assigns the disk a drive letter. • exit to quit.
If you're still having problems with the disk after trying this, you might try omitting the quick from step 9 to do a full format. That will take a very long time and usually isn't necessary, but may help uncover physical damage to the disk. In some cases you might need to re-initialize the disk. As above, this will destroy the data on the disk (or, rather, your ability to access it). To do that from diskpart.exe: • list disk • select disk n • attributes disk clear readonly. This command will unset the read-only flag on the disk. You can see the current attributes with attributes disk or detail disk.
• online disk. Sets the device status to online if it's been disabled. • convert mbr. Converts the disk to MBR format, which will work just fine for most disks. If you've got a USB disk larger than 2 terabytes, however, you'll want to use convert gpt instead. I'm not sure if the above commands are all identical on older OSs (XP). Download mac os emulator for windows.
WARNING: Formatting will erase all data on the device. Back up all your data before proceeding. Instructions below are for 10.11.x (El Capitan) and 10.12.x (Sierra) 1. Double-click on Macintosh HD - or in the Finder menu click File > New Finder Window 2. Click the Applications folder - if using a Finder Window Applications will 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.
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 • 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.