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Operations SDR2-USB Configuration Guide rev 1.0
16
3.2.2 Stopping recording
Incoming data is written to the open file as it is received until you stop
recording by pressing the record button. The SDR2-USB then closes the
file, updates its directory entry (recording file size, date, and time), and
returns to stop mode.
3.2.3 Device removal while recording
Do not terminate recording by removing the USB storage device without
stopping the recorder, or disk corruption may occur.
3.2.4 Power failure and improper shutdowns
If the SDR2-USB loses power while in record mode, it returns to record
mode after power is restored.
An improper shutdown may result in loss of data (due to sector buffering
and caching in the storage device) and minor allocation errors that can be
repaired using the Windows 95/98/NT/2000/XP/Vista™ Explorer or
chkdsk.exe from the Windows Command Prompt.
3.2.5 Filename generation
When operating with Append=0 (see section 4.1.3), unique new filenames
are generated based on the specified filename. This is done to avoid
overwriting an existing file within the specified folder.
Filenames are generated by “incrementing”. Before incrementing, the file’s
name is extended to 8 characters with a sequence of zeros. From there, the
filename’s last character is incremented through the digits 0-9 and A-Z,
carrying to the next-last as needed. An example of incrementing is shown in
Figure 3.1.
Before Incrementin
g
A
fter Incrementin
g
BRIDGE.DAT BRIDGE01.DAT
BRIDGE01.DAT BRIDGE02.DAT
BRIDGE09.DAT BRIDGE0A.DAT
BRIDGE0Z.DAT BRIDGE10.DAT
BRIDGE10.DAT BRIDGE11.DAT
Figure 3.1. Generating filenames when append mode is off.
3.2.6 Full storage media
When the storage media’s first valid partition is full, the SDR2-USB returns
to stop mode unless overwrite-oldest mode is enabled, in which case the
SDR2-USB will delete the oldest file in the target folder and return to
recording mode.