Take a look at the copyright study Tim Brooks and I did for the CLIR.
80,000 is a way-under number.
----- Original Message -----
From: "Tom Fine" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 15, 2006 5:00 PM
Subject: Re: [ARSCLIST] National Recording Preservation Board (NRPB) Study
>I honestly didn't know there were 80,000 unique 78 sides recorded! What is
> 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.)
>> [log in to unmask]
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