Product Description The Hi-MD MiniDisc allows users to record up to 45 hours of music with Hi-MD recorders, and up to 13.5 hours of music storage with NetMD recorders. Amazon.com Compatible with any HD MiniDisc player, this Sony HD MiniDisc can hold up to 45 hours of music when recorded at 48 kbps. Small, durable and compact, MiniDisc is a great, inexpensive, and reliable high-density format that can store documents, PC files, and images in addition to music. It's re-recordable, and provides brand-name Sony reliability. From the Manufacturer With the Sony HMD1G Hi-MD 1GB Mini Discs, you can store up to 45 hours of music on just one Hi-MD disc (at 48kbps recording). You can also use the Sony Mini Discs to store documents, PC files, and images. The HMD1G discs have all the benefits of standard Mini Discs -- they're small, re-recordable and incredibly durable, but with the added benefit of having greatly expanded space. A Mini Disc can easily fit in a shirt pocket, and with the incredible storage capacity of each disc, your entire music library becomes portable. Compatible with Hi-MD players, including the Sony MZ-NH1, MZ-NH900, MZ-NHF800, and MZ-NH600D.