CD is a good storage media is better than a hard disk

Status
Not open for further replies.
Jump to Latest
#22
milkshake said:
The signal coming from a CD laser is extremely jittery, . . . Feeding this signal without any jitter reduction into a DAC will result in audible artefacts.
Click to expand...
Feeding this signal without any decoding, de-interleaving, and error handling into a DAC will result in a very horrible noise, or complete silence, depending on how confused the DAC is. The processing to turn a raw CD data signal into a digital audio signal automatically synchronises it to a crystal clock.
 
#26
Calvin said:
if CD were soo good, how comes it needs CIRC error correction and interpolation?
Click to expand...
Good question.

Hard drives also use coding, although it is much simpler than CD. You can reasonably assume that a hard drive platter is not going to get scratched in normal use.

This appears to be one of those "this is what I believe" threads. The snake oil thread is mainly "this is what others believe".
 
#27
cyrilliu said:
If the WAV file is stored on the CD and USB CD/DVD/BD Drive connected to Raspberry Pi or other, so WAV file is read from the CD, not from the hard drive, and you will hear much better sound quality than a hard driver. This is because CD is a good storage media is better than the hard disk. It read less jiiter when WAV file is read from the CD. This is also one of the reasons why the sound of the CD transport can be better.
Click to expand...

Hard disk storage is good, SSD is better.

CD (whether CDROM or audio CD) can not be better than HDD or SSD due to much slower read speeds.

cyrilliu said:
A WAV file is made of, for example, 100 data units. When the WAV file is stored on CD, the 100 data units are stored continuously so that the time difference between each data unit is relatively small when the read head reads the data from CD, and there is almost no jiiter.

The same WAV file is stored in the hard driver, the 100 data units may be scattered on the driver, even if the hard drive has been defrag, so that the head read WAV file from the hard driver, the time difference between each data unit is relatively bigger and bigger jitter.
Click to expand...

I presume you are referring to non contiguous sectors - however the speed at which a modern SATA HDD reads pretty much renders fragmentation a non issue, unless it is a really large file that is fragmented, and even then, the read speed will most likely be fast enough to negate any fragmentation issues.

Generally, fragmentation is not an issue with SSD storage.

cyrilliu said:
Tape and CD are the same to stored continuously the data units, but CD has many holes on the surface of the CD to make the reflected light easily deflected, resulting in jitter. Also, the tape is fixed speed, unlike the CD is not fixed speed.
Click to expand...

CD reads at a constant linear velocity (CLV) so the read speed is constant.

CD can also re-read on the fly, usually without data loss.

cyrilliu said:
Tape is best.

The studio really pay attention to the recording quality, he will choose to use TAPE to store precious recordings.
Click to expand...

Tape can suffer from 'drop out'.

Tape (including DAT) can not (AFAIK) allow for re-reading data as tape readers / players are sequential access devices.

cyrilliu said:
Flash memory is the worst, because it uses of the same the hard driver with the decentralized storage means and when read WAVE file from flash memory, there will be a large number of transistors are turned on/off, and each switch speed is not the same, this is very easy to produce jitter. Flash memory will have a bunch of high-frequency noise.
Click to expand...

So much misinformation here.

What about all the "transistors turning on and off" in your CDROM / Tape recorder / DAT drive? :spin:

NOTE: All my comments above are in the context of reading audio data files / audio CDs.
 
Last edited:
#29
This thread needs hard science-backed numbers !

Price:
CD = 1.5€/GB
SSD = 0.4€/GB
HDD = 0.035 €/GB

Also the 4200 CDs stored inside a modern 3TB harddisk will require furniture and a half square meter of floor space, which at current housing prices of 3500€/sqm will set you back about the price of a nice pair of speakers... also CDs are more expensive than downloads...

Also of course you need a cd player.

Lifetime:
CD = 10 years if you're lucky and careful
HDD and SSD = infinite since backing up is easy and practical

Audio quality:
CD: 16/44
HDD/SSD: up to stupidly high and useless 24/384 but let's just say 24/96 or whatever it is you can download depending on your threshold of pain over prices and inclination to just steal it...

Practicality

Well, need I say more? I'm sure my CDs sound great, but I can't hear them from the boxes they're stored in...
 
#36
So where does put my setup; music (FLAC converted from CD-A) stored on a NAS which uses ZFS, Daphile which retrieves the files over a 100MBs network through two switches, through a preamp PGA2310, output over balanced cable to active speakers?

At least this thread serves one useful purpose.
 
#37
After reading this I feel that I should throw away my SSD storage with FLAC files and my network server.
Perhaps I can get a "boombox" CD player to hear better quality!

Then again, my Pass F6 clone and Jericho horns are probably so distorted that I would not hear the difference!
:headbash::headbash:
 
#39
peufeu said:
Sure, but we the french had to invent a tax on data storage media! 35 cents per CDR, thank you very much. Ka-chink!
Click to expand...
Over here too 😡 We have to pay copyright tax on empty CF, SD card, raw CD and DVD, even on USB stick. No matter if I will never store any music or film on them, only personal files and photos. Next time they will tax copy paper, because I can print copyrighted books on them (or they do it already?).
 
Status
Not open for further replies.
Top Bottom