Dell 0TK131 Rev. A01 Injected Noise Specifications, Reliability Specifications, Operational

Table 6-5 lists the environmental specifications of the PowerVault LTO-4-120 Half-Height tape drive.

Table 6-5. Environmental Requirements

Specification	Operational	Nonoperational
Airflow requirements	Internal: 6 CFM (front to back)	N/A
Altitude	-50 feet to 10,000 feet	-50 feet to 35,000 feet
Humidity gradient	10% per hour	10% per hour
Relative humidity	20% to 80% non-condensing	5% to 95% non-condensing
Shock (1/2 sine wave)	31G +/- 5%, 2.6 ms	71G +/- 5%, 2.0 ms
Temperature	+50° to +140° F	-40° to +149° F
	(+10° to + 60° C)	(-40° to + 65° C)
Thermal gradient	10° C per hour over temp. range	20° C per hour over temp. range
Vibration (sweep test)	0.005 inches DA (5-43 Hz)	0.1 inches (5--15Hz)
	0.50 G peak (43-1000 Hz) sweep rate 5-1000Hz; 1.0 octave per minute	1.0 G (15-500 Hz)
		1.0 octave per minute

Injected Noise Specifications

The LTO-4-120 Half-Height tape drive operates without degradation of error rates with 100 mV of noise injected between the chassis and 0 V at the power connector at any frequency between 45 Hz and 20 MHz.

Reliability Specifications

The PowerVault LTO-4-120 Half-Height tape drive is designed for maximum reliability and data integrity. Table 6-6 lists the reliability specifications.

Table 6-6. Reliability Specifications

Specification	Description
Cartridge load/eject	100,000 cartridge load/eject cycles (no thread)
Error recovery and control	•	Error correction code techniques
		(C1 and C2 ECC)
	•	Read-after-write (RAW)
	•	Error monitoring and reporting (error log)
	•	Retry on
Mean time between failures (MTBF)at 100% duty cycle with power applied and tape moving	250,000 hours
continuously
Mean time to replace (MTTR)	Less than 30 minutes
Nonrecoverable error rate	Less than 1 in 101 7 bits

Mean Time Between Failures

The mean time between failures (MTBF) is specified at 250,000 hours minimum. This specification includes all power-on and operational time but excludes maintenance periods. Operational time is assumed to be 100% of the power-on time. Operational time is the time the tape is loaded.

NOTE: The MTBF rating does not represent any particular drive, but is derived from a large database of test samples. Actual rates may vary from unit to unit.

Mean Time to Replace

The mean time to replace (MTTR) is the average time required by a qualified service technician to diagnose a defective drive and to install a replacement drive. The MTTR for LTO products is less than 0.5 hour (30 minutes).

The LTO drives are field-replaceable units. If a problem occurs with a subassembly or component in the drive, you should replace the entire unit. Return the drive to the factory in its original packaging. Contact your distributor, dealer, or computer system company, or the relevant representative to arrange the return.

LTO Cartridge Specifications

Environmental Considerations