Transcend offer two iOS compatible drives “ the JetDrive Go 300 and Go 500. Both are very similar in use but a little different in form. The Go 500 drive lacks 128GB capacity option but nearly all of the remaining of the specifications from the 2-year warranty to the read/write performance are the same. We’ll be specifically looking the 64GB Transcend JetDrive Go 300 they sent us to see what we think.