Record Hd to single HD?

[nyplayer]

How many HD streams can you record to a single 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5. Currently I have 4 OTA streams and 3 Cable TV streams that can record all once. Can a single drive handle this?

[routerunner]

Originally Posted by nyplayer

How many HD streams can you record to a single 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5. Currently I have 4 OTA streams and 3 Cable TV streams that can record all once. Can a single drive handle this?

HD streams OTA are 10Mbits maximum which roughly means 1Mb/sec and any HDD nowadays (not in RAID 0) should sustain at least 30Mb/sec consistent write speed, although performances vary depending on your HDD condition and seeking time, however you shouldn't worry about too much

Years ago, I had some WD Raptor, 10000 RPM, SATA I, RAID 0, sustaining write speed of 150Mb/sec, but now you can achieve 100Mb/sec on a single 7200 RPM HDD.

[wayner]

I thought that OTA streams are 19 Mbps, assuming no subchannels.

From Wikipedia:

terrestrial (over-the-air) transmission carries 19.39 megabits of data per second (a fluctuating bandwidth of about 18.3 Mbit/s left after overhead such as error correction, program guide, closed captioning, etc.),

[routerunner]

Originally Posted by wayner

I thought that OTA streams are 19 Mbps, assuming no subchannels.

From Wikipedia:

I think you're referring to the transponder bandwidth which indeed is about 19Mbits (although it depends on the QAM and FEC used that can rise the OTA bandwidth up to 31Mbits). AFAIK broadcasters cannot afford to have a single channel per transponder so many channels get squeezed into one transponder sharing the bandwidth.

In my post I was referring to a single channel bandwidth, also in Europe our OTA uses DVB-T/T2 standard whereby HD channels are 10Mbits maximum, however only one transpoder in UK have 31Mbits bandwidth shared by three HD channels, for all the others the bandwidth per channel is a lot less.

Roughly speaking in the DVB standard the order of bandwidth availability and therefore the maximum bitrate per channel from the higher to the lower is: DVB-C (cable), DVB-S (satellite), DVB-T (terrestrial)

The same channel trasmitted via satellite or terrestrial can show evident difference in quality, but things are improving and the gap is getting marginal.

On the 28th February 2013 the DVB-T standard has officially landed in USA and believed it will quickly superseed the ATSC standard.

Eddy

[emveepee]

Here where I live in Canada ATSC which shares the US standard, it much higher than 10Mbs. If you watch the streams with TSReader they are about 20Mbs but the saved payload is about 16-17 Mbs.

Martin