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How data is stored
To provide continuity of storage when the disk is removed, the data storage feature buffers data internally
for a period of time based on the storage rate and amount of storage data. Since storage files and
configuration files may not be stored on the same disk, you can swap the storage disk with a configuration
disk for up to the buffered data time period while loading configurations without losing storage data. See
Data Storage in section 4.26 for more information on buffered data. When the storage disk is re-installed, or
when another disk is initialized using the current schedules, the buffered data will be transferred to the disk.
Initializing a disk
Initialization creates separate areas on the disk for each type of data to be stored. Data types that can be
stored are up to 3 Trends, Alarms, Events, Diagnostics, and Unit Data. You can initialize a disk using the
current storage schedule or using a new storage schedule.
When data storage is active, the instrument determines the status of the disk. Status can be one of the
following possibilities.
Disk status
The "current" disk was inserted
back into the drive.
Some other disk was inserted.
That is, disk is blank, contains
old data files or contains
configuration files.
Initializing a disk using the same storage setup
For 120MB or Zip disks it is recommended you preinitialize the disk using DSU. See Data Storage in
section 4.26 for more information.
To continue storing the same data storage schedule on this disk, select the online DATA STORAGE menu,
select INITIALIZE DISK, then select USE CURRENT SCHEDULES. The instrument will display a
prompt asking for a yes or no response to initialize the disk. Initializing will destroy all existing
information on a 1.44MB disk. With this prompt you can remove a disk inserted by mistake, or
deliberately re-use an old disk containing useless information. If you answer YES, the current schedule will
be established on the new disk, buffered data will be stored to the disk, and if any storage files are in batch
mode, the batch counter will be reset to zero (0).
Initializing a disk using a new storage setup
For 120MB or Zip disks it is recommended to preinitialize the disk using DSU. See Data Storage in section
4.26 for more information.
If you change any part of data storage schedule (as described in Section 4.26) and you want the changed
(new) schedule's data to be stored, select the online DATA STORAGE menu, select INITIALIZE DISK,
then select USE NEW SCHEDULES. All data that was buffered since the previous disk was removed is
lost. See Data Storage in Section 4.26. If you change the schedule but initialize using the current schedule,
the changed (new) schedule is not stored.
12/00
Table 7-3 Disk Status
The instrument will resume storage to this disk automatically.
In this case, a DISK NOT CURRENT message is displayed and data is
stored in a buffer, not on the disk.
VPR &VRX – User Manual
Online Operation Using Menus
Result
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