I honestly didn't know there were 80,000 unique 78 sides recorded! What is the material?
Steven, do you think you have more disks than Joe Bussard? Did I understand you correctly that you
have 40 THOUSAND unique 78's (ie no repeats)? Or, how much of that is overlap?
-- Tom Fine
----- Original Message -----
From: "Mike Richter" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 15, 2006 4:36 PM
Subject: Re: [ARSCLIST] National Recording Preservation Board (NRPB) Study
> steven c wrote:
>> I have about 80,000 78 sides to (eventually) archive in digital form.
>> As moderate-quality MP3 files of, say, 500KB each...I would need
>> about 40,000MB...or 40GB, which I could store on a single not-too-
>> expensive drive. Wav files would be (I think) about 20 times the
>> size, or .8TB (for I don't know how much...).
> The numbers are easy enough and probably worth sharing here.
> Redbook WAV (two channels, 16 bit depth, 44.1 ksps, PCM) is about 10 MB/minute. Minimum quality
> suggested is usually one channel, 16 bits, 22.05 ksps for 2.5 MB/minute. (In practice, 10-12 bit
> depth would suffice, but I know no software for that; 8 bits is pushing it.)
> Lossless compression is more effective on quiet material than on noisy, so you can't count on more
> than 40% reduction.
> The usual compression for MP3 is about 11:1. Good recognition is achieved from 78s at 32 Kbps
> (22.05 ksps, monaural) which means four minutes per MB. On average, a 78 side is likely to run
> 3-3.5 minutes - so be a pessimist and say 4 minutes. 80,000 sides would then be around 80 GB in 32
> Kbps MP3 up to 3.2 TB in redbook WAV or equivalent (e.g., 32 bits depth but single channel). Go to
> archival extremes such as two channels, 96 ksps, 32 bits, PCM and you're looking at 16 TB - not
> impossible today nor even a great fortune, but probably more expensive than the benefits for
> access are worth. (Access is distinguished from archival purposes; the cost/benefit analyses
> differ for those two.)
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