Flash Drive will not format with Disk Utility

I am in need of help. I have looked through a ton of forums looking for the answer to this but can't find anything. I have a flash drive that I was using and while I was transfering a large file the drive unmounted and now it is showing "Read only". In the Disk Utility, the Erase and Repair are grayed out. When I verify the drive it says this:

Checking file system** /dev/disk1

** Phase 1 - Preparing FAT

** Phase 2 - Checking Directories

/CJB/myfolder/_Reference/AA45608_737_Livery_7b_RtRear_d_RGB.tif has too many clusters allocated (logical=1235222528, physical=1719664640)

Drop superfluous clusters? no

** Phase 3 - Checking for Orphan Clusters

Free space in FSInfo block (1439592) not correct (1379432)

Fix? no

424 files, 11035456 KiB free (1379432 clusters)

Error: This disk needs to be repaired. Click Repair Disk.

I have also tried:

diskutil repairVolume CHAD

I have located the drive in terminal and this is what it says:

drwxrwxrwx@ 1 BDesign staff 8192 Dec 31 1979 CHAD

When I show information in Disk Utility it shows Writable No. Can anyone help me. I don't need the info on my Flash Drive. I just want to format it and get it working again.

Thanks