NEC 4550A DVD-RAM problem with LM-HC47LU

I bought a 5-pack of Panasonic DVD-RAM (LM-HC47LU) to test out on my burner. It could read the blanks OK (they were recognized and my (Linux) box could write to 'em OK), but when the drive tries to write to them it creates write errors (“Medium Error/No Seek Complete”) and messes 'em up so bad it destroys the internal formatting on 'em 'till they became “coasters” and won’t even read back in the drive. I even switched from the MadDog to the Liggy firmware; no difference.

I’ll be trying another brand (I think there’s a Fuji brand available here retail) today.