Table 86. Memory Drives
Drive Recommended File Types
CPU:
1
cr1, .CAL
USR:
2
cr1, .CAL
USB: .DAT
CRD:
Principal use is to expand final-data memory
(p. 515), but it is also used to store .JPG, cr1,
and .DAT files.
1
The CPU: drive uses a FAT16 file system, so it is limited to 128 file. If the file names are longer
than 8.3 characters (e.g. 12345678.123), you can store less.
2
The USR: drive uses a FAT32 file system, so there is no limit, beyond practicality and available
memory, to the number of files that can be stored. While a FAT file system is subject to
fragmentation, performance degradation is not likely to be noticed since the drive has very fast
access because it has a relatively small amount of solid state RAM.
3
The CRD: drive is a CompactFlash card attached to the CR1000 by use of a CF card storage
module
(p. 653). Cards should be formatted as FAT32 for optimal performance. The card format
feature in the CR1000 will format the card with the same format previously used on the card.
8.3.1.1 Memory Drives — On-Board
Data-storage drives are listed in table CR1000 Memory Drives (p. 373). Data-table
SRAM and the CPU: drive are automatically partitioned for use in the CR1000.
The USR: drive can be partitioned as needed. The USB: drive is automatically
partitioned when a Campbell Scientific mass-storage device
(p. 653) is connected.
The CRD: drive is automatically partitioned when a memory card is installed.
8.3.1.1.1 Data Table SRAM
Primary storage for measurement data are those areas in SRAM allocated to data
tables as detailed in table CR1000 SRAM Memory
(p. 372). Measurement data can
be also be stored as discrete files on USR: or USB: by using TableFile()
instruction.
The CR1000 can be programmed to store each measurement or, more commonly,
to store processed values such as averages, maxima, minima, histograms, FFTs,
etc. Data are stored periodically or conditionally in data tables in SRAM as
directed by the CRBasic program (see Structure
(p. 123) ). The DataTable()
instruction allows the size of a data table to be programmed. Discrete data files
are normally created only on a PC when data are retrieved using datalogger
support software
(p. 95).
Data are usually erased from this area when a program is sent to the CR1000.
However, when using support software File Control menu Send
(p. 515) command
or CRBasic Editor Compile, Save and Send
(p. 511) command, options are
available to preserve data when downloading programs.
8.3.1.1.2 CPU: Drive
CPU: is the default drive on which programs and calibration files are stored. It is
formatted as FAT16, so it has a limit of 128 files. Do not store data on CPU: or
premature failure of memory will likely result.
374
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