In most cases, the Backup Server uses a default tape density and block size that are optimal for your operating system; Sybase recommends that you use them these defaults.
You can specify a density, block size, and capacity for each dump device. You can also specify the density, blocksize, and capacity options in the with clause for all dump devices. Characteristics that are specified for an individual tape device take precedence over those that you specify using the with clause.
See the Reference Manual: Commands
