FL007 Incorrect SD Card Serial Number Encoded In Log File
Incorrect SD Card Serial Number Encoded In Log File #
| Problem ID | Manufacturer | Affected Firmware | Affected Hardware | Status |
|---|---|---|---|---|
| FL007 | Frontier Labs | 3.30 | BAR-LT | Minor problem |
Within the Vorbis Comment section of FLAC files, Frontier Labs identify the SD Card CID, represented as a 16-byte hexadecimal string. The SD Card serial number can be found in bytes 10-13 of that hex string.
On five test recordings made using different SD cards there seems to be a bug in which the SD Card serial number from the log file isn’t matching the serial number encoded into the CID. As shown in the table, the bytes are matching except for the two most significant bytes in the CID serial number (the serial number from the log file is given in decimal and has been converted).
It appears the value in the log file is incorrect.
This website was used to extract the values of the CID and double check the decoded values.
We exracted values from the log files, and headers, and compared them:
| (A) Recording | (B) Log file serial number | (C) SD card CID | (D) serial from CID (hex) =MID(C3,19,8) | (E) serial from CID (dec) =HEX2DEC(D3) | (F) simulated problem =HEX2DEC( RIGHT(D3,6)) |
|---|---|---|---|---|---|
| Test Recording 1 | 8041328 | 035344534431323885437AB37001480F | 437AB370 | 1132114800 | 8041328 |
| Test Recording 2 | 11217428 | 03534453443132388588AB2A140148D1 | 88AB2A14 | 2292918804 | 11217428 |
| Test Recording 3 | 9090564 | 035344534431323885458AB604014809 | 458AB604 | 1166718468 | 9090564 |
| Test Recording 4 | 4774740 | 0353445344313238854448DB54014801 | 4448DB54 | 1145625428 | 4774740 |
| Test Recording 5 | 14793234 | 03534453433132388046E1BA12013AFB | 46E1BA12 | 1189198354 | 14793234 |
In the simulated problem column we can see that by trimming the hexadecimal serial value (using the RIGHT) function we can simulate the values found in the log file.
Status of the problem #
Minor issue, the correct data is in the header for the files.
Waiting for reproduction of problem from QUT Ecoacoustics
Status with vendor #
We’ve asked FL for comment, they have not yet responded.
Effects of the problem in common tools #
No effect - the CID information is currently not used in any tools we know of; EMU may be able to detect and repair this problem if the sensor log file is found near the files.