[LAU] Large live recrodings ?

[Svend-Erik Kjær Madsen]

Hi 

I'm no techie but isn't the calculation regarding how fast your harddisk
must be quite simple, if we assume working in 44100KHz ?

A normal CD delivers 150Kb pr. second and its two tracks, so storing
multichannelrecordings in 44100 must be something like 75Kb per second X
times as X is the number of tracks.

I have no doubts that my Lenove T61P with sata disk can store more than
the 75Kb * 18 my RME Multiface offer, else the thing is broken.

/Sv-e
ons, 02 07 2008 kl. 21:20 +0200, skrev David Forsyth:
> Date: Wed, 02 Jul 2008 13:38:11 +0200 (CEST)
> From: "Kjetil S. Matheussen"
> 
> David Forsyth:
> >> 
> >> At this point, I'd be happy to do an 8 track recording.  For
> >> important live recordings I would not use a laptop, but instead a
> >> decent desktop with a RAID 0 array of at least 3 SATA2 disks for
> >> the audio files, with the system on another disk.
> >> 
> 
>  >I think that is complete overkill. I just tried recorded 128 channels 
>  >of 32bit/44100hz at once, without problem. And my machine is 5 years 
>  >old 2Gz barebone, using only a single PATA ide disk.
> 
>  >This was using jack_capture, and only recording silence (ie. 
>  >non-connected jack ports). Maybe the silence makes a difference.(?)
> 
> I think you're missing all the interrupts that would happen if your 
> audio hardware was sampling and sending data to the jack ports.
> and then the conflict between the PCI transfers of that data and the 
> DMA->PCI transfers to disk...
> 
> I had trouble with my 8 channel setup until I sorted out the SATA 
> settings.  I still say that for a large important (one chance) recording 
> I'd use more hardware than a laptop can supply, even if I have to hire 
> it or assemble it specially for the show.
> 
>  >256 channels did not work very well though.
> 
> heh (-:
>