HDD must set as MASTER mode to avoid unpredictable problem.
Timeshift Buffer takes 4GB per hour and max. 4Hrs, recording quality is fixed at HQ mode.
There are 5 recording quality modes for vidoe in, here is approximate space takes :
HQ mode = 71MB/min
SP = 36MB/min
LP = 25MB/min
EP = 18MB/min
SLP = 13MB/min
The min. space is 10% of rest capacity.
Besides Timeshift buffer and recording space, others will be formatted as FAT32 format for media storag which can be accessed by PC througth USB connection.