There are abundant formats of optical absolute to deejay recording accessories on the market, all of which are based on application a laser to change the reflectivity of the agenda recording average in adjustment to alike the furnishings of the pits and acreage created back a bartering optical disc is pressed. All formats accredit account of computer files as abounding times as adapted by the user, but autograph is a altered situation. Some formats such as CD-R accredit writes to be fabricated alone already to anniversary area on the disk, while added formats CD-RW accredit assorted writes to the aforementioned area which is added like a alluring recording adamantine deejay drive (HDD). In August of 2011, a aggregation alleged Millenniata appear a architecture alleged the M-Disk3 which, reverting to the aboriginal technology of optical disks, creates concrete pits in a rock-like layer. The M-Disk is abiding up to 500 °C (932 °F), is impervious to clamminess issues, and is engineered to advance its candor for 1,000 years after degradation.