Cant format flash drive on mac

Thank you!! I was thinking throw away my usb, but finally I found a post that helped me to revive my flash drive, I really appreciate it!

Here's how to format USB on Mac

Last login: Thu Oct 2 EFI POSIX reports: Cannot allocate memory. I tried disk utility and terminal but always get this message: Konstantin I admit the tips you presented are helpful in recognising an unreadable USB. My only question is will it work for minor corruption only or for the drive with severe corruption. I tried: Name required.

Apple Footer

Mail will not be published required. Notify me of follow-up comments by email.


  • Fix 'Can't Format USB Flash Drive' Error and Restore It to Full Size – EaseUS?
  • Can't format flash drive.
  • external cd rom drive for mac air.
  • USB - How do I format my USB Flash Drive on a Mac? | Integral Memory.
  • Format An Unformattable Flash Drive In OS X.
  • USB - How do I format my USB Flash Drive on a Mac?!

Notify me of new posts by email. Tips and Tricks. Griff October 27, at Konstantin Bulenkov October 31, at Ameer October 31, at Adam December 31, at I tried this however I am getting the following.

How to restore unreadable USB flash drive under Mac OS X « Konstantin Bulenkov's personal blog

Konstantin Bulenkov March 9, at Absolutely agree with you Phil. For Konstantin Bulenkov March 10, at Matt September 18, at Ruben October 29, at David Anderson November 11, at Get the following from terminal any ideas?: Click on the USB drive in the sidebar and then choose Erase from the toolbar at the top of the window.

Choose a security level using the slider. However, it also increases the time it takes to format the drive quite considerably.

Popular products

You can download CleanMyMac X for free here. Which should you choose?

How to Format a Flash Drive on a Mac - Demonstration

The main reason for formatting a USB drive as Fat32 on a Mac is that you want to be able to use the drive on a Windows PC, as well as a Mac — perhaps to transfer files between the two machines. You may also be preparing the drive for use as, say, a storage device for a media player or to record TV programmes on a TV with a USB port.

Windows won't allow me to format USB, help!

The fact that Fat32 can be read from and written to on both Mac and Windows makes it very versatile. However, there is a significant limitation — individual files have a maximum size of 4GB.

Fix 'Can't Format USB Flash Drive' Error and Restore It to Full Size

There is a solution, however, exFAT. If you look for a quick and easy way to manage your drives, try using CleanMyDrive 2. With its help, you can drag-and-drop files directly to any drive, clean hidden junk from external drives, and check disk stats. All the drives will be at hand in the menu bar, so you can get to see types of drives you have and manage them easily.

There are a couple of things you should keep in mind, however.