Extreemly slow mount of USB Flashmemory

I wanted to format an old 2GB USB Flashmemory. It had no problem to mount before i erased it. I used Partition to remove old FAT32 partition and to create a new ext3-partition.
Now the USB pen want be detected when i plug it in. It can take 15-20 minutes until it get detected and when its finally detected and mount, then its write-protected.

What is the problem?