On 29/04/14 20:23, Clive George wrote:
On 29/04/2014 19:29, Johny B Good wrote:
On Tue, 29 Apr 2014 16:53:02 +0100, Clive George
wrote:

On 29/04/2014 16:18, Johny B Good wrote:

[1] around the equivilent performance of a high quality cassette deck
with accurately aligned dolby level. Realistically, a C90 TDK SA tape
would only manage the equivilent of 700MiB of storage.

Really? That implies a C90 is capable of similar quality levels to CD,
and I'd be very surprised if that was the case.


What you seem to have overlooked is the extra 18 minutes of run time
compared to a 74 minute CD (C90s were typically 46 minutes or so each
way).

No, I didn't. That takes it to 560-odd MB vs 700, ie it's holding 80% of
the information. Are cassettes really that good?


No.

the bandwidth is very low. AS is the SNR

Id say you can get about 4Khz bandwidth at about 55dB SNR.

ie about 10 bits deep and 4khz so 40Kbps.

216Mybtes for a C90. maybe 300+ using the edges of the spectrum and
pushing towards 6Khz and more.


Really the cassette tape has nothing to recommend it anymore at all.


When you can get 8Gbyte on a thumb drive...that costs the same as a few
blank cassettes.

I think te final nail in te coffin for me was hen I was looking to
backup a wew tens of GB on my home server.

It wpuldnt fit on a DVD.
A tape wss around 200 and I would need dozens of tapes to do a 'nightly
copy' There would be no guarantee the tape would be usablle
anyway..BTDTGTTS


IN the end the thing that did the job of protecting me against hard disk
failure was...another hard disk!

cheapests and simplest option.

Th backup drive went earlier this year. In with a new one, and leave it
running over the weekend absorbing all the data .

If any of the main ones hop its really just a question of copying all
the data back..

Now I am looking at my first SSD/SD machine. NO spinning rust at all.

Another seminal moment..



--
Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.