Quantum sdlt 220 Guía Del Usuario
SDLT 220 and SDLT 320 Product Manual
CHAPTER 3: Drive Specifications
81-85002-01
March 2004
3-3
3.1.3 Storage Capacity
provides native and compressed capacity ranges for the Super DLTtape I
data cartridge:
In accordance with industry practice, a typical compression ratio of 2:1 is quoted.
Actual compression ratios achieved depend on the redundancy and type of data
files being written.
Actual compression ratios achieved depend on the redundancy and type of data
files being written.
3.1.4 Compression
The drive contains on-board hardware to compress and decompress data using a
DLZ algorithm. The default setting for data compression is ON.
DLZ algorithm. The default setting for data compression is ON.
3.1.5 Data Integrity
SDLT data transfer errors are extremely rare; data integrity for the overall tape
system is shown in
system is shown in
.
Table 3-2.
SDLT 220/320 Storage Capacity
SDLT 220
SDLT 320
Native Storage Capacity
110 GB
160 GB
Compressed Storage
Capacity
Capacity
220 GB
(2:1 compression ratio)
(2:1 compression ratio)
320 GB
(2:1 compression ratio)
(2:1 compression ratio)
Table 3-3.
Data Transfer Error Rates
Error Type
Frequency
Detected, Recoverable (ECC) READ
<1 error in 10
6
bytes read
Detected, Unrecoverable READ
<1 error in 10
17
bits read
Undetected READ
<1 error in 10
27
bits read
Rewrite of Data
<5 per 10
6
bytes written