4 GByte/hr is about DVD quality. Typically a DVD movie is about 6-7 GByte. There is no standard on the bandwidth, since this entirely depends on how much the stream is compressed.
I suggest you look at the specification for you mpeg encoder. That should give you a hint about the maximum amount of data.
However, even doubling the amount of data to 2 MByte/s is still relatively little compared to HD performance.
But note: Obviously you resulting quality is never better than your source. Since you intend to record TV and/or VHS the stream can be compressed to well below 1MByte/s without loss of quality.
<i><b>Engineering is the fine art of making what you want from things you can get</b></i>
<A HREF="http://www.btvillarin.com/phpBB/viewtopic.php?t=655" target="_new">My systems</A><P ID="edit"><FONT SIZE=-1><EM>Edited by HammerBot on 12/03/02 03:41 PM.</EM></FONT></P>
I am a little surprised about all this though.
I remember that one of the reasons why many people won't use 5400rpm harddisks, is because they are "not fast enough for video recording". They also stated that for video recording, a 30Mbyte/s are needed. I suppose that this is for "non-compressed" video? What else could possibly need 30Mb/s to record?
Once again, thanks!
I'll go buy that tv card now.
Greetings from Belgium;
December 3, 2002 6:45:21 PM
You probably mean video EDITING not RECORDING requires the superfast drives. As stated video recording requires relatively small amounts of memory bandwidth. Video editing on the other handwould require infinite bandwidth in the limit to allow for instantaneous work completion.
Think of it like this: if for example you decide your video turned out a bit too red (hued), you could implement some software technique of removing or reducing the effect, but to do that all the video data must be accessed decompressed, operated upon, recompressed and restored. As you can see there are many more things happenning during editing.
Strange that your 5400rpm is louder than your 7200rpm drive.
Maybe the 5400rpm is of an older generation?
At home, we have 2 drives of the same generation:
- a 40Gb Maxtor 720x 7200rpm
- a 40Gb Maxtor 540 5400rpm
I can tell you, the 7200rpm drive makes this annoying whine, while the 5400rpm one is inaudible. I have to put my head inside the case in order to hear the 540!
Reliability: That's another reason to go for a 5400rpm drive.
BTW, I read a test on harddisks yesterday.
The test had some weird results!
It concluded that:
a. The much hyped 7200rpm Barracuda IV has lower average read and write scores than the 5400rpm Maxtor Fireball III.
b. Western Digital's "JB = special edition" drives also have lower average read and write scores than their non-special edition brothers. And they were not much faster than the Fireball III either.
So what's the deal about 7200rpm? Their "peak" scores may be much better, but isn't it the average score which is the most important?
December 9, 2002 7:09:10 PM
Lower read write scores are better, as they are a measure of the time it takes to complete the task.