When trying to install .iso onto the 15gb stick. it starts running then it tells you it finished, there is nothing on the stick.
the stick shows 15gb unallocted

The command below i run.

dd bs=4M if=/home/jim/Downloads/Fedora-i386-25-1.3.iso of=/dev/sdb

I assume the drive is not mounted and you are you running the command as root or using sudo?

Does the dd command output any messages like bytes read/write?

Have you looked at the output of the dmesg command for errors?

Hopefully your using the correct device ID and not overwriting another disk...

"I assume the drive is not mounted and you are you running the command as root or using sudo?"

Yes running as su .

"Does the dd command output any messages like bytes read/write?"

something like ;
357+1 records in
357+1 records out
1.5gb,1.4gib copied.

"Have you looked at the output of the dmesg command for errors?"

No I did not check dmesg

"Hopefully your using the correct device ID and not overwriting another disk..."

This is a Laptop that has only has one hard drive /dev/sda

/dev/sdb is what gparted shows the stick is located at and has 15gb unallocated.

__when I plug in stick, I'am getting , invalid Partition table - recursive partition on /dev/sdb.

________________

If you are using gparted to decide the disk is unallocated, you might just try booting the usb anyway. Fedora 25 Live usb installs a "hybrid" partitioning scheme to allow booting by either MBR or UEFI. I recently did a dd of Fedora 25 live xfce spin to an 8gb usb stick, and when I plug the usb into another fedora computer, gparted shows very screwy results, including thinking the usb is much larger capacity than it actually is, and showing the bulk of the usb drive unallocated. But the live usb works fine for me when booted.

I also recently installed a full Fedora Xfce onto a 64gb usb. Boot another usb with Fedora Live, insert the 64gb, then choose "Install to hard disk", being careful to select the 64gb usb as the target for the installer.

This also worked fine, ending up with a full system and persistence. The only difference is the installer didn't install a "hybrid" boot, so right now the 64gb system only works with a UEFI computer, since I had booted the original live usb in EFI mode, that's what got installed.