
SDLT 220 and SDLT 320 Design & Integration Guide CHAPTER 8: Insertion and Extraction Guidelines
81-81148-01 March 2004 8-3
8.1.2 Loading a Tape
These commands pertain to loading the data cartridge:
• AT T E N T IO N
• LOAD
• DISABLE AUTO TAPE THREAD
• ENABLE AUTO TAPE THREAD.
For detailed information about these commands, and for more information about
the General Status Packet shown in Figure 8-1 on page 8-2, refer to the Super
DLTtape™ Interactive Library Interface Specification (6464162-01) document.
Realistic Expectations
The SDLT 220/320 tape drive should typically complete the reset and recovery
process in less than one minute, although it is possible that heroic (extensive) data
recovery retries—in some cases—can take longer. A tape drive that does not
recover within several minutes requires manual intervention. Several causes,
including a defective data cartridge, may be causing the failure to load event. The
data cartridge should be inspected after a failure to load or unload event.
Exception Conditions
The tape drive sets the Hardware Error bit in the event of hardware failure. Status
Byte 3 will post a Hardware Error and Cartridge Present if there is a detected tape
load or unload failure. The tape drive always attempts to recover from a hardware
problem by resetting the servo processor. The Hardware Error bit will be cleared if
recovery was successful.
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