[Hanyouyomi]

I'm trying to reboot my 4GB travel drive because my iMac won't read it. I've tried using Disk Utility, but I can't preform first aid on it. And when I tried to back it up on my WD passport, I get the "Unable To Validate error 254" message.

I'm using Yosimete 10.9.5, so how do I fix this?

[germainebull]

It appears your challenge does not yet have takers. We seem to have tech novices here.

[earthsalt]

It appears your challenge does not yet have takers. We seem to have tech novices here.

I sympathize with OP. But it might be merely because qualified users have not yet seen OP's post.