Quantum Instruments DLT 7000 manual Power on Self Test Post, LED Activity During Density Selection

	Hardware Implementation
Table 2–9	LED Activity During Density Selection
If…	Then…
The density Select Button	The lighted LEDs show the actual density when the tape is
is not used	being read from and written to. The LEDs light steadily;
	Density Override LED remains off.
The density Select Button	The LED that reflects the actual density and the Density
is used and the actual	Override both are lit. For example, if the actual density is
tape density is the same	10.0 GB and 10.0 GB is selected via the Select Button, the
as the density selected	LED next to “10.0” lights.
via the button
The density Select Button	The LED that reflects the actual density lights steadily. The
is used and the actual	LED that reflects the SELECTED density blinks. The Density
tape density differs from	Override lights steadily.
the density selected via	For example, if the actual tape density is 10.0 GB and the
the button
	selected density is 6.0 GB, the 10.0 LED lights steadily, the
	6.0 LED blinks, and the Density Override LED lights steadily.

Selecting Density via the Host over the SCSI Bus

1.Use the SCSI MODE SELECT command to indicate the desired density (Chapter 5).

2.Write data to the tape from BOT.

2.5POWER ON SELF TEST (POST)

When power is applied to the tape drive, the drive performs a POST. POST completes in about 15 seconds and the tape drive should respond normally to all commands; POST is complete after Stage 2 in Table 2-10. However, it might take longer for the media to become ready.

After a bus reset, the tape drive responds within a bus selection time-out period (per the ANSI SCSI specification). A reset may have the Tape In Use indicator blinking because a reset forces the tape to be rewound to BOT.

The following table lists the sequence of events:

Quantum DLT 7000 Tape Drive 2-23