Maximum number of directly addressable entities supportable by this controller. A value of zero should be used if the number is unknown.

由这个控制器支持的直接寻址的实体的最大数目。如果数字不详，请用零值。

youdao

In addition to a higher storage capacity than past LTO generations, LTO 5 also offers new architecture features such as the LTFS file system that turn magnetic tape into a directly addressable data source, like a hard disk drive.

FORBES: Magnetic Tape Turns 60