How do I format a thumb drive that is 250GB as FAT or FAT 32?

Posted on 2009-04-24
Medium Priority
Last Modified: 2013-12-01
I have swissknife, HP USB DISK FORMAT tool and I have tried using the format tool in CMD to format my thumbdrive as FAT and FAT 32.  No luck.  In swissknife, I have a message that says "Media is write protected. Format cannot be completed".  I am almost certain it may be possible to format my flashdrive.  Can someone help me?
Question by:Submedown
LVL 88

Expert Comment

ID: 24223622
Try using gparted on a liveCD like puppy or systemrescuecd to partition and format your disk:

LVL 50

Expert Comment

ID: 24223640
Just check that there isn't a slide switch somewhere on the thumb drive that needs to be moved to unprotect the drive so you can format it.
LVL 47

Expert Comment

ID: 24224881
Follow the advice of dbrunton, there are some flash drives with write protection functionality. Normally this could be a small switch key on flash drive body.
In case there is no such switch then your drive turned bad. Return it to shop if the warranty not expired yet.
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Expert Comment

ID: 24224964
Also, found this utility that repairs some of flash drives: http://www.apacer.com/en/support/downloads/Repair_v2.9.1.1.zip
In case yours is bad only. Happens you have warranty - do not use any tool, simply replace it.
LVL 26

Accepted Solution

souseran earned 1000 total points
ID: 24229967
What specific model of Flash Drive are you using?
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Expert Comment

ID: 24229997
I ask because of FAT limitations. If your drive really is 250Gb, unless you want a lot of really small partitions (max volume size 2 GB) you won't be able to format it as FAT. You'll have to use FAT32, which has a 2TB max volume size.

Expert Comment

ID: 24230173
You could try partitioning and formatting using Max blast:


It's a large download, but give that a try, seems to have good reviews.

LVL 34

Assisted Solution

Michael-Best earned 1000 total points
ID: 24230911
Since the biggest thumb/flash-drive is 64GB, I wonder about this question.
HDD/SSD can be 250GB.
If 250GB then NTFS is recommended.
FAT info:
thumb/flash-drive formatter:

Author Comment

ID: 24234947

Thanks for your help.  Your feedback gave me a direction but the Flash drive is in fact a 240GB Sony USB Micro vault.  I purchased it from China the week before and it is a fake drive.  It can be detected in XP explorer and disk management but cannot be formatted with any utilities.  In a nutshell it has been modded and cannot be used at all.  Thank goodness, I did a tough bargain.

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