How to format flash drive on mac lion


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Disk Erase Failed. I get similar errors constantly when using USB hubs on Mac with external drives, but when plugged directly into Mac the hard drives work. Having the identical problem connected directly to USB on the back of iMac. How do you tell if it is locked?

Which format to choose?

I have a new maxone external drive, and it is not recognized in the left-hand panel of the Disk Utility. It is connected by USB cable, plugged directly into mu iMac. I have an Iomega Ext. The storage is half full with over MB of storage left. Am I able to continue with the formatting without erasing the current files that are already on it? I have a 1TB Toshiba external hard drive, I have been using on my iMac and have been able to read an write on it. Why is it working on my iMac and not on my macbook pro? It seems that the hard drive is formatted for Windows but it does work read and write on my iMac.

Do I need to format this external drive to be able to use in more than one Apple computer? The one single thing, arguably one of the most important bits has been skipped altogether from this guide….

Format an External Hard Drive or USB Flash Drive for Mac OS X

Majority if not all flash drives come not only with Windows dominant file systems, but also MBR formatted, vs the Mac where the operating system is always installed to a GPT partitioned disk. Format for Mac compatibility as described, I use it with every disk.

How to Create a Bootable Mountain Lion 10.8 USB Install Thumb Drive

You do not need to mess with schemes, this is not Windows. This is Mac. In this case you are formatting the drive to be Mac compatible. This is not about Windows.

Mac Format choices for USB flash drives

Just trying to figure out if I need to back my pictures up to a second hard drive before I do this. Backup everything you want to save. Nothing is left on the external hard drive after formatting is completed.


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  6. This post is a lifesaver even 5 years down the track! Hi, I did what it said. But two of my USB are ruined, my computer cannot read them anymore. I kinda wanna cry. If you format a hard drive it erases the data on it. That is what formatting does, it erases a drive. What else do you think erasing a drive is supposed to do except erase the data? I purchased a 4TB WD external drive and having a heck of a time reformatting this drive.

    I have tried all the above advice without getting to have this new hard drive formatted. Any other suggestions? I just keep getting the error Disk erase failed. There must be something new with High Sierra Is there an option besides just declaring the data irretrievable, and more importantly, how does a USB uninitialize itself? Will I be able to copy and share media across both Mac and Windows? I am Computer-Eleteret lol. Now My Mac is about There. I just have no Clue how to do it.

    Name required. Mail will not be published required. All Rights Reserved. Reproduction without explicit permission is prohibited. Enter your email address below: Posted by: Andy Robinson says: January 4, at 4: Fernando says: January 4, at AppleExpert3 says: November 12, at 2: AstroExpert2 says: July 6, at 3: Emaven says: January 4, at 8: April 22, at 4: Joe says: June 27, at 8: Sam says: July 28, at 8: August 21, at Roger says: April 10, at NYCer says: January 8, at 7: Ahmed says: November 26, at Lina Alvarez says: September 17, at 9: January 25, at 3: Thasleem says: March 17, at Debbie says: March 25, at 4: Timothy says: April 3, at 1: May 6, at Deon says: January 13, at 8: Yes says: January 13, at 9: January 13, at Noreen says: September 14, at 2: April says: October 10, at 8: Sayna says: April 29, at 3: July 6, at Jared says: September 24, at 1: Keith says: December 17, at 6: December 17, at December 21, at December 22, at January 9, at 9: Dorothy Swayne says: October 31, at 4: Margaret F Sadler says: December 4, at 7: Negar says: February 6, at Aiman says: February 20, at AudioHTIT says: June 14, at 9: Ankush Goel says: June 18, at Nigel says: Updated November 14, OS X Lion installer.

    This is available from the Mac App Store. You can use a larger drive if you wish, but more important than the size of the flash drive is its speed. If you're buying a new flash drive just for Lion, I recommend buying one of the fastest available. While slow read: Some free time. The creation time varies by the speed of the USB flash drive, but plan on 30 minutes to over an hour. All data on the USB flash drive will be erased. In the Disk Utility window, look for the flash drive in the list of attached devices. Look for the device name, which usually appears as the drive size followed by the manufacturer's name, such as 16 GB SanDisk Cruzer.

    Select the drive not the volume name , which may appear below the drive manufacturer's name , and click the Partition tab. Use the Volume Scheme drop-down window to select 1 Partition. Enter a name for the volume you're about to create. Click the Apply button. Disk Utility will display a sheet asking if you're sure you want to partition your USB flash drive. Click Partition to continue.

    How to Format a Drive on a Mac

    Open the Contents folder. Open the SharedSupport Folder. Right-click the InstallESD. Close the Finder window. This will create a copy of the InstallESD. Launch Disk Utility , if it's not already open. Click the flash drive device not the volume name in the Disk Utility window.


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    Click the Restore tab.