Blank — (data set information)

If you leave the Option field blank, information about the selected data set is displayed. The information displayed is the same information displayed by option I on the Library Utility panel (option 3.1). See I — data set information for more information and U — uncatalog data set for an example. To return to the previous panel, press Enter or enter the END command.

Note:

For multivolume data sets, options I and S display current allocation and utilization values that represent totals from all volumes used.
You can not enter a volume serial when you are requesting information on a multivolume data set.
The space for data sets allocated in blocks is calculated as if all of the tracks, including the last one, contain only full blocks of data. Any partial "short" blocks are ignored.
The information shown for current space utilization is the actual data that the data set contains, based on the number of allocation units (blocks, tracks, bytes, megabytes, and so on) that have been written. For a data set allocated in units other than tracks and cylinders, it does not include the unused portion of a track that is only partially filled.
For example, if a data set allocated in bytes with block size of 600 has one block written to a device with a track size of 1000, 600 bytes of data are written and the remaining 400 bytes cannot be used by a different data set. A track is the smallest possible unit of physical allocation to a data set on DASD. ISPF reports 600 bytes used while other products (such as ISMF) report 1000 bytes used. ISPF reports the space occupied by data in the data set. ISMF reports the space used by this data set that is not available for use by another data set. The difference is a relative indication of the effectiveness of the block size used when the data set was created.
Space utilization values are not displayed for VSAM or BDAM data sets.

See Information for managed data sets for information about the data set information that is displayed for managed data sets.