SONY MD data disc MMD-140. Features write-protect function. Rewritable disc. I no longer have a device to use it with, and haven't used it in a while, so I haven't been able to confirm the data or writing capabilities. I'm selling it as junk in its current condition. It's difficult to see in the photos, but there are some scratches on the resin surface, as if something was written on it. - Brand: SONY - Model Name: MMD-140 - Capacity: 140MB - Write-protect function: Yes