USB Flash Drive wont restore

Hi All
After some help please
I have a 32gb Toshiba pen drive , which i was copying new files onto and the mac came up with the error " Disk has been ejected" , so i pulled the drive out of the usb slot as i couldnt see it in my finder.
When i try and use it my iMac wont recognise it at all , however when i launch Disk Ultility it appears, but the lower section of the drive in the menu side is all greyed out and when i try and erase it or verify/repair it etc i get the following error :
Filesystem formatter failed
unable to write to last block of device.
Any ideas
Many Thanks in Advance

It sounds to me like you have a defective flash drive. About all you can do is toss it in the trash and get a new one.
Regards.

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    5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
    6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
    This may fix boot problems with new flash drives because they are often prepared by the manufacturer with NTFS. To fully clear the drive you must both partition and format the device. Writing zeros has in some cases helped make a drive bootable when at first it was not.

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