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COS Data Handbook v.3
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COS Data Handbook > Chapter 2: COS Data Files > 2.5 Data Storage Requirements

2.5
Users are reminded to consider the large size of counts and flt files when allocating disk space for storing and reprocessing COS data. Additionally, corrtag files with a large number of events can be quite large. These images serve as intermediate or final calibration products from the pipeline and have the file sizes given in Megabytes in Table 2.13. Note, that these sizes are per exposure, and an associated observation set may have several exposures.
Table 2.13: COS Pipeline Data Volumes per Exposure
0.5MB1
1MB2
1
Values pertain to x1d_a or x1d_b files only. These files are temporary output products from calcos processing
2
Values are in addition to amounts given for each segment.

Similarly, users are reminded of the large cumulative size of calibrated COS spectroscopic datasets. Table 2.14 provides volume estimates for calibrated COS datasets.
Table 2.14: COS Pipeline Data Volumes per Calibrated Exposure
Standard calibrated files1
+ 39 bytes per photon2
+ 36 bytes per photon3
1
Minimum volume delivery option over the internet
2
Approximately 70 MB per BUFFER-TIME
3
Approximately 52 MB per BUFFER-TIME


COS Data Handbook > Chapter 2: COS Data Files > 2.5 Data Storage Requirements

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