Format flash drive mac exfat

This is called a directory file set, and a MiB sub-directory can hold up to 2,, file sets.

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If files have longer names, this number will decrease but this is the maximum based on the minimum three-record file set. To help improve the sequential searching of the directories including the root a hash value of the file name is derived for each file and stored in the directory record. When searching for a file, the file name is first converted to upper case using the upcase table file names are case insensitive and then hashed using a proprietary patented algorithm into a bit 2 byte hash value.

Each record in the directory is searched by comparing the hash value. When a match is found, the file names are compared to ensure that the proper file was located in case of hash collisions.

About exFAT

This improves performance because only 2 bytes have to be compared for each file. This significantly reduces the CPU cycles because most file names are more than 2 characters bytes in size and virtually every comparison is performed on only 2 bytes at a time until the intended file is located. There are three checksums currently in use. The checksum sector is a checksum of the previous 11 sectors, with the exception of three bytes in the boot sector Flags and percent used.

How to format a drive in exFAT so it works on both Windows and Mac

The most common cause could be a boot sector virus, but this would also catch any other corruption to the VBR. A second checksum is used for the upcase table. This is a static table and should never change. Any corruption in the table could prevent files from being located because this table is used to convert the filenames to upper case when searching to locate a file. The third checksum is in the directory file sets.

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Multiple directory records are used to define a single file and this is called a file set. This file set has metadata including the file name, time stamps, attributes, address of first cluster location of the data, file lengths, and the file name. A checksum is taken over the entire file set and a mismatch would occur if the directory file set was accidentally or maliciously changed. When the file system is mounted, and the integrity check is conducted, these hashes are verified. Mounting also includes comparison of the version of the exFAT file system by the driver to make sure the driver is compatible with the file system it is trying to mount, and to make sure that none of the required directory records are missing for example, the directory record for the upcase table and Allocation Bitmap are required and the file system can't run if they are missing.

If any of these checks fail, the file system should not be mounted, although in certain cases it may mount read-only. The file system provides extensibility through template-based metadata definitions using generic layouts and generic patterns. Accordingly, exFAT support was effectively limited to Microsoft's own products and those of Microsoft's licensees, which in turn inhibited exFAT's adoption as a universal exchange format.


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Interoperability requires that certain results be achieved in a particular, predefined way an algorithm. For exFAT, this potentially requires every implementation to perform certain procedures in exactly the same way as Microsoft's implementation. Some of the procedures used by Microsoft's implementation are patented, and these patents are owned by Microsoft. Regardless of whether open-source or not including Samsung's leaked kernel driver source that was initially fraudulently rebadged as GPL-licensed ; [55] [56] Microsoft stated that "a license is required in order to implement exFAT and use it in a product or device.

It may also be possible to achieve the intended results without infringing Microsoft's patents. There was, however, discussion within Microsoft of whether Microsoft should allow exFAT in Linux devices, [60] [61] which eventually resulted in Microsoft publishing the official specification for open usage [7] and releasing the exFAT patents to the OIN in August From Wikipedia, the free encyclopedia.

Windows Embedded CE 6. This section is in list format, but may read better as prose. You can help by converting this section , if appropriate. Editing help is available. October Also, since I don't know whether you are on a PC or Mac to perform this operation. I'm here to break down this guide into two parts. The first part is for Mac users, the second part is for PC users Windows 10 based. In no particular order. Please note: since OS X The app now has a new user interface that looks slightly different on Yosemite or earlier OS X versions.

Step 1 : Open Disk Utility. Step 2 : Under "External" tab, highlight your flash drive. Note: right below your device name, it also shows information about the drive e.

Step 3 : Now click the "Erase" button at the top. In the new pop-up window, choose the format to be "ExFAT".


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You may also change the device name if you want. Then hit the "Erase" button to continue. Kind reminder: make sure you have backed up the data before you do this. Step 4 : Wait until the erasing process to complete. It should be very quick only a few seconds to format my 32GB Lexar drive. Step 5 : This step is optional.

I'm showing this to verify that the USB drive has been reformatted to the file system I wanted. I saved several files to the disk, and open Disk Utility again.

How to Format USB flash drive in macOS Mojave

And yes If you are on an earlier operating system like Windows 7, XP, etc. The screenshots may look slightly different.

Step 2 : A new window pops up prompting options you need to select before starting. The only thing you have to check is under "File system", make sure you have chosen "exFAT". You may also rename the device drive under "Volume label". The Best Tech Newsletter Anywhere. Join , subscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android.

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How to format USB flash drive using FAT/FAT32/NTFS/exFAT & Recover Data after Format

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