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Re: [ARSCLIST] Preservation media WAS: Cataloguing still :-)
Cheap computers are junk ! Not just the CD/DVD drives,either.I know,I have bought enough of them,and have moved up the price range,until I got to the top of the line Apples/Power Macs.I cannot afford the price of a new one,but there are very affordable rebuilt,and upgraded units up on eBay.Based on the competition,I faced buying mine,there are a lot of people,who caught on,
Roger Kulp
Tom Fine <tflists@xxxxxxxxxxxxxxxxxxx> wrote: Speaking of drives, one man's observation here. The crop of Chinese or Korean CD-ROM and DVD-ROM
drives being put in both dirt-cheap and mid-priced PC's today are as low-grade as I've ever seen.
Very poor mechanisms, likely to lead to disc-read errors. The writing drives are not much better,
although, for instance, I've been surprised how reliable the Philips DVD/CD writing drive in my Dell
E510 has been (good enough that I haven't felt the need to spring for a Plextor). The worst seem to
be the no-name stuff coming out of China that are found in lower-end Dell and HP. So before one
condemns digital storage as "unreliable," one should make sure one has reliable hardware.
-- Tom Fine
PS -- I won't even get into how horrible the built-in audio is on most modern computers. Ever since
Intel started building it into the motherboard, it's been a race to the bottom. Soundcrapper is now
considered a deluxe add-on!
----- Original Message -----
From: "Jerome Hartke"
To:
Sent: Sunday, September 03, 2006 7:09 AM
Subject: Re: [ARSCLIST] Preservation media WAS: Cataloguing still :-)
>> -----Original Message-----
>> From: Association for Recorded Sound Discussion List
>> [mailto:ARSCLIST@xxxxxxx] On Behalf Of Mike Richter
>> Sent: Saturday, September 02, 2006 8:33 PM
>> To: ARSCLIST@xxxxxxxxxxxxxxxx
>> Subject: Re: [ARSCLIST] Preservation media WAS: Cataloguing still :-)
>>
>> steven c wrote:
>>
>> > Well, there is an upper limit to the accuracy of any analog data-storage
>> > technology...if nothing else, the molecular qualities of storage media
>> > define a limit (albeit a VERY large one!). In fact, I would suppose this
>> > would also apply to digital media?!
>>
>> Digital media incorporate error correction in order to reduce the
>> probability that an error will affect the result. In fact, the raw error
>> rate of digital recording tends to be very high, but layers of ECC
>> reduce it essentially to whatever resulting rate is acceptable.
>
> Optical media raw bit error probabilities are typically a few per million
> (ppm) for good discs. This is very low. ISO limits are 58 ppm for DVD and 70
> ppm for CD. There are lots (hundreds of thousands) of raw errors on a disc
> because there are trillions of bits. Error detection and correction normally
> reduces the read error rate of data to the host to zero. Of course, bad
> discs or drives can and do cause problems, similar to attacking a tape with
> scissors.
>
> Jerry
> Media Sciences, Inc.
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