The iFlash 4th Gen iPod to iFlash Converter is an adapter designed by Tarkan that allows for iFlash boards to be used with the iPod (4th generation) , the iPod photo (4th Generation Color), and iPod (3rd generation). These iPods have Hard Drive connectors that are different than the iPod Video and iPod Classic.
One alternative to having to use one of these connectors is to get a board designed for the 4th/3rd generation iPods. As of now, the only iFlash board that natively supports these iPods would be the iFlash-ATA1.
Resources
iFlash's webpage on the 4th Gen iPod Converter: https://www.iflash.xyz/store/4th-gen-iflash-converter/