Quantum DLT 2000 Handbook page 70
Quantum dlt 2000: user guide
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Also See for DLT 2000:
- User manual (2 pages) ,
- Supplementary manual (2 pages) ,
- Product manual (345 pages)
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than for a drive with rotating heads. DLTtape media is more durable
than other types of media by a very wide margin.
Data Integrity – Error Correction
The important figure in terms of data integrity is the uncorrected bit
error rate, sometimes referred to as the hard error rate. Uncorrected bit
error rate is the number of erroneous bits that cannot be corrected by
error correction algorithms. For DLTtape and Super DLTtape drives,
we have calculated an uncorrected bit error rate of one bit in 10
That is one error in 100 quadrillion bits, or one error in 12 quadrillion
bytes. How does that compare to other technologies? Most DAT drives,
for one example, quote a spec of one uncorrected error in 10
is 100 times less than 10
errors on the DAT drive than on the DLTtape drive.
Modern high-density tape technologies, which record more data
on smaller segments of tape, have made error correction quite
complex. High-density tape drives have to recover a higher per-
Channel 1
Channel 2
Channel 3
Channel 4
S
Y
PRE
N
C
Figure 6-3 A DLT 8000 20-block Data Entity
entity contains 16 data blocks and 4 blocks of Error Correction Code, ensur-
ing data integrity.
17
. Therefore, you can expect 100 times more
1
5
9
2
6
10
3
7
11
4
8
12
C
USER
USER
R
DATA
DATA
C
Direction of Tape Motion
13
ECC1
14
ECC2
15
ECC3
16
ECC4
I
I
I
N
N
N
C
E
D
D
D
USER
R
D
CONTROL
E
E
E
DATA
X
X
X
C
C
1
2
3
is shown above. Each
QUANTUM DLTtape HANDBOOK
17
bits.
15
bits. 10
15
C
R
POST
C
6.7
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