Iomega REV 120GB 34173 Manual De Usuario
Los códigos de productos
34173
2.6:1
Compression
the data set. Standard English, both fiction and non-fiction, is
represented by books and papers (labeled book1, book2, paper1,
paper2, paper3, paper4, paper5, paper6). More unusual styles of English
are found in a bibliography (bib) and a batch of unedited news articles
paper2, paper3, paper4, paper5, paper6). More unusual styles of English
are found in a bibliography (bib) and a batch of unedited news articles
(news). Three computer programs represent artificial languages (progc,
progl, progp). A transcript of a terminal session (trans) is included to
progl, progp). A transcript of a terminal session (trans) is included to
indicate the increase in speed that could be achieved by applying
compression to a slow line to a terminal.
compression to a slow line to a terminal.
All of the files mentioned above use ASCII encoding. Some non-ASCII
files are also included: two files of executable code (obj1, obj2), some
geophysical data (geo) and a bit-map black-and-white picture (pic). The
geophysical data (geo) and a bit-map black-and-white picture (pic). The
file called “geo” is particularly difficult to compress because of a wide
range of data values, while the file “pic” is highly compressible because
of large amounts of white space represented by long runs of zeros.
range of data values, while the file “pic” is highly compressible because
of large amounts of white space represented by long runs of zeros.
The Corpus Data Set can be found at:
Results of IAB 2.0 Pro Testing
Testing the Calgary Corpus data set on IAB Pro backing up to an Iomega
REV drive using the “high” compression setting in the software yielded
REV drive using the “high” compression setting in the software yielded
2.6:1 compression results with a 1.8GB data set and 2.7:1 compression
results with a 5GB data set. The results are summarized in the table
below.
results with a 5GB data set. The results are summarized in the table
below.
Compression ratios achieved with “high” compression setting in
IAB Pro:
IAB Pro:
Capacity of Calgary Corpus Data Set
Compression Ratio Results
1.8 GB set
2.7:1
5.0 GB set
2.7:1
These results were achieved using the system outlined in Appendix A.
How to Reproduce the Results
In order to reproduce the results stated above, a copy of the Calgary
Corpus data set is required along with an empty hard drive and copy of
IAB Pro. To ensure that the drive is truly empty, it should be formatted
IAB Pro. To ensure that the drive is truly empty, it should be formatted
before starting the test. The first step involves creating a folder on the
now-empty drive and copying the Calgary Corpus test suite into the
now-empty drive and copying the Calgary Corpus test suite into the
folder. In order to create the 1.8GB data set, the Calgary Corpus is
copied 597 more times. In order to create the 5GB data set, the Calgary
copied 597 more times. In order to create the 5GB data set, the Calgary
Corpus is copied 1,661 more times.
The second step entails launching the IAB Pro application and then
The second step entails launching the IAB Pro application and then
selecting the system backup option. The third step involves working with
the IAB 2.0 wizard to select the correct volume, which contains copies of
the IAB 2.0 wizard to select the correct volume, which contains copies of
the Calgary Corpus. The fourth step is choosing the option to keep the
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