My pendrive is not working and showing Unknown file System
Solution 1
In most cases what you have to do (I'm assuming you have some version of Windows XP +) is go into CONTROL PANEL > ADMINISTRATOR OPTIONS > COMPUTER MANAGEMENT > Disk Management and then FORMAT the visible drive (usually you might have to delete the partition if something happened to the drive that resulted in corrupt/invalid data). I've had this happen before when formatting a USB to be bootable, it might fail and not mount properly after.
This trick via the management panel, will allow you to manage all your drives. Only formatted drives will show up under MY COMPUTER.
Solution 2
There is a process you can use to format unreadable drives from the command line, I often find it necessary on USB pens that are causing me real headaches.
Open up CMD (open it as administrator if you're running Windows Vista or 7 and UAC) and type the following:
diskpart
In the prompt type in:
list disk
This will present a list of disks, e.g.:
DISKPART> list disk
Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 149 GB 0 B
Disk 1 Online 7751 MB 0 B
As you can see from the example I have a 150GB disk, disk 0, and an 8GB disk, disk 1, being the USB pen. The next step is completely wipe the USB device:
DISKPART> select disk 1
Disk 1 is now the selected disk.
DISKPART> clean
DiskPart succeeded in cleaning the disk.
Finally we need to create a primary partition on the disk and format it, in this case as fat32:
DISKPART> select disk 1
Disk 1 is now the selected disk.
DISKPART> create partition primary
DiskPart succeeded in creating the specified partition.
DISKPART> format fs=fat32 quick
100 percent completed
DiskPart successfully formatted the volume.
DISKPART> exit
Once you've completed the above steps you should have completely reformatted your USB and it will be ready for use.
N.B. if you get access denied at any point during this process it is likely that you need to run the CMD prompt as admin.
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Deb
Updated on September 18, 2022Comments
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Deb almost 2 years
I have a pendrive when I insert it into one o my port it shows in the My Computer but when I try to explore, it shows please insert a disk into drive H. However my usb drive is well inserted. I tried to format it but it is showing There is no disk in drive H, Insert a disk then try again. Its properties is showing Unknown File System and the used space and free space part showing 0 bytes. I cann't also check for errors in the drive. Its device status:The device is working properly. I also reinstalled the driver but that did not help me. Please suggest some way to recover the issue.
Thanks.-
ephsmith almost 12 yearsCould you clarify your OS?
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Matteo almost 12 years@ephsmith I added the generic Windows tag because of "My Computer" and drive "H".
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Akshat Mittal almost 12 years@ephsmith Its definitely Windows according to the Error Messages.
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ephsmith almost 12 yearsSemantics... It'a clearly Windows. I guess I should've been more clear. Which version of windows. ?
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Deb almost 12 yearsits windows xp sp3
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Tomin Jacob over 9 yearsIf none of the solutions suggested in the 3 answers worked for you, your pendrive is damaged, no doubt about that. I had faced this issue early and was unable to repair it.
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Deb almost 12 yearsI tried this option but I am getting only one disk that is my hard disk only. I have two USB's one is working well but neither of them is showing in my command prompt. The USB which is working well, should be showing in the prompt but it is not showing.