
SDLT 220 and SDLT 320 Product Manual CHAPTER 3: Drive Specifications
81-85002-01 March 2004 3-3
3.1.3 Storage Capacity
Table 3-2 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.
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.
3.1.5 Data Integrity
SDLT data transfer errors are extremely rare; data integrity for the overall tape
system is shown in Table 3-3.
Table 3-2. SDLT 220/320 Storage Capacity
SDLT 220 SDLT 320
Native Storage Capacity 110 GB 160 GB
Compressed Storage
Capacity
220 GB
(2:1 compression ratio)
320 GB
(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
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