the reason of asking for such cable is the following:
i got a stupid NAS with 5 drives (which is bricked) and the only way to upload FW and re-use it again (for me of course) is via USB flash
which is equiped with custom linux booting whatever
the problem is that the FW image is big (about 320mb) which takes time to extract/deploy
without any Activity Indicator i got stuck ( in the middle of no where ) i cannot tell if the process is finished or not
thnx for the Quick

where i used a Sony 32GB flash (which has LED flashing) and by then i managed to get it back online
now am happy and can use it for my own
thank you all
subject closed