Unable to initialize Thumb drive using Disk Utility!

Hi All,
I have a 4GB Sandisk thumb drive that works flawlessly till I tried to initialize it using Disk Utility in my MBP.
Now, whenever I try to connect the drive to USB port, system ask me to initialize the disk but when I try to initialize system goes into an unfinite loop of unmounting the disk.
And now when I try to format it using Windows, the message appears that "Unable to complete the format". The disk was working in both Windows and Mac prior to I used initialize function.
Any help would begreatly appreciated.
Thanks in advance.
-Ashish Sharma

Hi Samberl,
As I already wrote in my initial post that the drive was working before I try to intialize using MBP. Anyways, I already followed your advice and replaced the drive with a new one. But now I am worried if I again use it in my Mac and initialize using disk utility. As of now I have formatted it using Windows and using NTFS-3G in my MAC to read or write the data.
Anyways, thanks for helping

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Last login: Thu Apr 10 18:03:08 on console
wr-130-64-184-253:~ betsyk$ diskutil list
/dev/disk0
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   0:      GUID_partition_scheme                        *320.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            319.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
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map -hosts on /net (autofs, nosuid, automounted, nobrowse)
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Filesystem   1M-blocks   Used Available Capacity iused   ifree %iused Mounted on
/dev/disk0s2    304425 274476     29698    91% 70329971 7602931   90%   /
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