Step 4: Enjoy / Problem solved, Now you can use your USB on both mac & PC and finally Fix the USB or Drive Compatibility for Mac & PC. From the editor’s desk: Well, it depends on your work and your comfort to choose which format suits you.
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Go to command prompt (Start>Run, then enter cmd in the prompt and press enter) Type Format X: /FS:FAT32 [Enter] (where X is the drive letter of your hard-disk) There'll then be a warning saying all data will be erased if you continue. Press y [Enter] to continue. It'll take a few minutes depending on the size of the drive. See if you can now access your drive in windows explorer.
If not, you may need to use a program called formatfat32 (I had to when I formatted mine). Unzip to the C: drive and in Command Prompt type CD [Enter] (to navigate to the C: root) FormatFat32.exe X: [Enter] (again where X is your hard-drive letter). This should only take a few seconds, but after that my drive was accessible from both my PC and PS3.
The overwhelming majority of USB flash drives you buy are going to come in one of two formats:. The first format, FAT32, is fully compatible with Mac OS X, though with some drawbacks that we'll discuss later. If the drive comes formatted in NTFS, which is the default file system for Windows, you're going to want to re-format the drive because Mac OS X can't write files to NTFS-formatted volumes (at least not without a bunch of extra work that's beyond the scope of this article). How do you tell which format your brand-new USB drive has? Hook it up to your Mac and launch the Disk Utility app, located in your Utilities folder (which is in Applications).
Your new drive should appear in the left-hand column, and clicking the 'Partition' tab will bring up info on the drive which includes its current format. If the drive's format comes up as MS-DOS (FAT) or, less likely, ExFAT, you may be able to simply leave the drive as-is and not bother reformatting it. If the drive is listed as NTFS-formatted, you're going to need to format it to something else if you want full compatibility with Mac OS X. There are several possible file system formats you can use for a USB flash drive, and changing them in Disk Utility is as easy as selecting the number of partitions you want on the drive (usually just one), picking the format you want for the drive, and clicking 'Apply.' Note that this will erase all information on the drive, so make absolutely sure you've got copies of everything before moving forward.
Disk Utility gives you five different choices for drive formats in OS X Lion. Unless you have extraordinary needs, you can safely ignore two of them: Mac OS Extended (Case-sensitive, Journaled) and Free Space. I'll discuss the advantages and disadvantages of the other three formats below. Mac OS Extended (Journaled) - This is the default file system format for Mac OS X drives. Advantages: Formatting your USB flash drive this way will give you full interoperability with Macs. It also includes support for features from OS X Lion, such as.
You can even if you have the right files, the know-how, and a big enough flash drive, which will allow you to boot your Mac off an external disk if something goes wrong with your built-in drive. The 'Mac OS Extended (Journaled)' option will have the highest degree of support for Mac OS X features, and there's no limit to the size of files you can put on the drive. Disadvantages: Windows-running PCs can read files from drives formatted this way, but they can't write to them (at least not without the same amount of work it takes to get OS X to write to NTFS-formatted drives). If you're transferring files from Macs to PCs, this won't be an issue; however, transferring files from PCs to Macs won't be possible if your drive is formatted in 'Mac OS Extended (Journaled).' If you will only be working with Macs and not PCs, this may not be an issue.