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. 

## Offboard data string searching 

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. 

## Enhanced logic to report logical end-of-tape (LEOT) 

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. 

## High-resolution tape directory 

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. 

## Channel calibration and dynamic adaptive equalization 

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. 

## Speed matching 

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: 

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 

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, 41 MBps - 163 MBps for 3592 JB or JX cartridges that are initialized in Generation 3 format 

GLYPH<SM590000> A total of 13 speeds, 39 MBps - 151 MBps for 3592 JB or JX cartridges that are initialized in Generation 2 format 

The TS1140 tape drive increases throughput through speed matching while the drive performs the following functions: 

GLYPH<SM590000> Adjusts tape speed based on host data rate 

GLYPH<SM590000> Calculates effective host data rate (EHDR) 

GLYPH<SM590000> Optimizes data rate by selecting optimal EHDR 

GLYPH<SM590000> Forces speed changes mid-wrap if advantageous 

GLYPH<SM590000> Minimizes time to record data 

