IBM 5100 - Page 175

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Chapter 9. More Things to Know About the 5100
DATA SECURITY
You are primarily responsible for the security of any sensitive data. After you
are through using the 5100, the data in the active workspace can be removed by
one of the foil owi ng:
• Using
the )CLEAR command to clear the active workspace
• Pressing the RESTART switch
•
Turning the POWER ON/OFF switch to off
There are several methods available for protecting or removing sensitive data on a
tape. These methods are:
• Assigning
a password to the workspace when writing the active workspace on
tape.
• Rewriting a tape file, which makes the old data inaccessible.
• Filling a data file with meaningless data. For example, the following user-
defined function fills file 4, a data file named DATA on tape 1, with zeros:
VBECURITY[[]]'\i'
V SECURITY
[:l.J :~ 1]8VD .(.~.
[2] A~'OUT 4 ID=(DATA),
[3J B~ 10 1000 pO
[ll·] "Jf~:A~H
[5] 4(A[1]=O)/WR
'V
Note: ERROR 010 ddd will be displayed after the data file has been filled with
zeros. When this error is displayed, enter
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