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"double post - sorry"

Hello all! I have installed 10 cameras - "DS-2CD2020 type". And I'm using the newest iVMS-4200 app. But i have problems with the scheduled recording. Sometimes they lost the signal, and didn't recording anything. Then when i want to playback the recordings - it wrote out that there a Playctrl.dll error, or there nothing to playback. Another time for example, we tried to playback the "B cam" recordings, and it turns out to "E cam". I though it is a software bug, or something else. iVMS-4200 10 DS-2CD2020 camera I'm using a simple PC with 2 TB hdd (as NAS) - I shared the directories for the cameras (now i tried a new method, 10 cameras, 10 shared directories for each of them.) Yet I haven't know the solution for that (maybe it will be good) The 10 cams are communicating via local network. What should I also check for the proper functioning? Which software I need to install? (yet already the iVMS 4200, media center, storage server). I already configured the iVMS. It is really necessary to format the HDD for each cameras? It's really long time..but i try it. Any advice? Thanks!