This is a WORM/ Write-Once-Read-Many Times / disk. This is not a REWRITABLE disk.
optical media are 5.25-inch discs compatible with a wide range of optical
drives. They're treated with advanced polycarbonate substrate for extra
durability and shock resistance. They support ISO standards and are tested up to
50 years of proven media life thanks to the optimized recording layers and
Media Type - Magneto-Optical disk
Media Form Factor - 5.25''
Storage Removable Capacity (Native)- 4.8 GB
Recording Format - 1024 Bytes / Sector
Write Speed - 4X