DW appliances are marketed for data volumes in the terabyte to petabyte range. In July 2008 Seagate Technology announced a 1.5 terabyte SATA hard drive using PMR technology. Nalimov tablebase requires more than one terabyte of storage space. All images were recorded in HD and 4K on three terabyte hard drives. For realistic problems, the required storage can reach the order of 1 terabyte of data. The terabyte is a multiple of the unit byte for digital information. As an example, a Boeing 787 generates over half a terabyte of data per flight. Teradata systems were the first to store and analyze 1 terabyte of data in 1992. The unit symbol for the terabyte is TB. The full resolution 12 terabyte dataset from Bock et al. is available at "NeuroData". A terabyte of video was broadcast on the video screen every minute. The second 80 terabyte rack became operational in San Francisco that same year. Teradata built the first system, over 1 terabyte, for Wal-Mart in 1992. SnapCenter has controller based licensing for AFF/FAS systems and by Terabyte for SDS ONTAP. According to Cryptome, the then nineteen years of logs added up to about one terabyte.