Exabyte VXA-2, Руководство по эксплуатации продукта, Страница: 64 / 90

54
P
RODUCT
M
ANUAL
1009541
Chapter 8 S
PECIFICATIONS
P
ERFORMANCE
S
PECIFICATIONS
This section describes the performance specifications for the tape drive. The
tape drives are factory tested to these specifications using VXAtape media.
D
ATA
T
RANSFER
R
ATES
Table 8-2 lists the maximum data transfer rates that the tape drive can achieve.
R
EAD AND
W
RITE
S
PECIFICATIONS
Table 8-3 provides read and write specifications for the VXA-2 tape drive.
Table 8-2 Maximum data transfer rates in megabytes per second
Interface
Data transfer
rate (native)
Data transfer rate
(compressed)
a
a
Assumes a 2:1 compression ratio.
Burst transfer
rate (maximum)
SCSI Ultra2 LVD 6.0 MB/second
b
b
One megabyte equals 1,000,000 bytes.
12.0 MB/second 80 MB/second
IDE/ATAPI Ultra
DMA 4
6.0 MB/second
12.0 MB/second
66.7 MB/second
FireWire 6.0 MB/second 6.0 MB/second 10 MB/second
Table 8-3 Read and write specifications
Backward compatibility
with VXA-1 drives
a
§ Reads tapes written by a VXA-1 tape drive.
§
Writes VXA-1 formatted tapes, so that the VXA-1 drive can read the data.
Compression ALDC (Adaptive Lossless Data Compression)
Bit error rate Less than 1x10
-17
Partitions 2
Buffer 2 megabytes (MB)
Error detection and
correction
4 layer Reed Solomon
Format Discrete Packet Format
Heads (4)
§ 2 write/read heads
§ 2 write check/read heads
Data media
§ VXAtape cartridges with Advanced Metal Evaporated (AME) media. The
tape drive ejects other types of media.
§ No formatting or conditioning required prior to use.
§ 30-year archival life.
a
The VXA-2 drive can read or write VXA-1 formatted tapes. However, the VXA-1 tape drive cannot read and write VXA-2 formatted tapes,
nor can it use the V23 cartridge.