This buffer improves the drive agility, file access, and small file handling. Furthermore, the  buffer reduces backhitches for all workloads and improves overall read/write performance. The TS1140 EH7 tape drive can search the data content of host records for string matches  offboard from the host server. The tape drive can perform this search at the maximum data  rate (250 MBps native). It takes much longer for a host server to read the data, buffer the data  to disk, and then parse the actual data stream with host software routines. LEOT is now reported, based on a combination of capacity-based and position-based LEOT  indicators. The TS1140 EH7 monitors the total accumulated number of physical tape data  sets that is written to the volume and reports LEOT based on this capacity-based LEOT  value. LOET allows tape copies to complete without overflow more often. The TS1140 EH7 tape drive maintains a tape directory structure with a high granularity of  information about the physical position of data blocks on the media. This high-resolution tape  directory (HRTD), plus the increased search speed, improves the TS1140 EH7 nominal and  average access times for locate operations. To gain optimum performance,  channel calibration  allows the drive to automatically  customize each read and write data channel. The customization compensates for variations  in the recording channel transfer function, for media characteristics, and for read and write  head characteristics. Initial calibration settings are calculated and stored at the time of  manufacture. For optimum error rate performance, the TS1140 tape drives also use dynamic  adaptive equalization hardware on an ongoing basis to adjust the read equalization response.  The  speed matching  function is improved on the TS1140 tape drive because both the number  of speeds and the range of supported data rates are improved. The data rate range depends  on the logical format and the media type: The TS1140 tape drive increases throughput through speed matching while the drive  performs the following functions: Chapter 2. TS4500 Ultrium Linear Tape-Open and 3592 tape drives  131 GLYPH<SM590000> Minimizes time to record data  GLYPH<SM590000> Forces speed changes mid-wrap if advantageous  GLYPH<SM590000> Optimizes data rate by selecting optimal EHDR GLYPH<SM590000> Calculates effective host data rate (EHDR)  GLYPH<SM590000> Adjusts tape speed based on host data rate GLYPH<SM590000> A total of 13 speeds, 39 MBps - 151 MBps for 3592 JB or JX cartridges that are initialized  in Generation 2 format GLYPH<SM590000> A total of 13 speeds, 41 MBps - 163 MBps for 3592 JB or JX cartridges that are initialized  in Generation 3 format GLYPH<SM590000> A total of 13 speeds, 74 MBps - 203 MBps for 3592 JB or JX cartridges that are initialized  in Generation 4 format  GLYPH<SM590000> A total of 13 speeds, 76 MBps - 251 MBps for 3592 JC, JK, and JY cartridges that are  initialized in Generation 4 format Offboard data string searching Enhanced logic to report logical end-of-tape (LEOT) High-resolution tape directory  Channel calibration and dynamic adaptive equalization Speed matching