At 2:28 PM -0800 1/5/2009, aussieshepsrock wrote:
>There are "Ultra-High Grade" Discs made with Gold (to resist
>corrosion), High Grade Plastics to resist scratches and etc, and with
>the use of 'higher' stability Dyes (?) all put together with high
>quality construction processes in their production. The prices are
>very high for these discs compared to the el-cheapo spindles on sale
>every week at the BigBox stores. eg: a hundred discs are 150 bucks
>versus 10 bucks. The 'Tested' theoretical life of these gold disks are
>300yrs versus 100yrs for 'normal' High Grade disks.

The few times we've used such, they did seem to last longer.  But 
they still threw errors eventually.

Data integrity is achieved with multiple backups.  I really doubt 
using expensive media will significantly increase the reliability.

>Where is an organization like this for storage mediums.

There are corporate groups and ITU committees, and NIST...  The 
former deals with PR efforts and the latter two just maintain and 
report upon the functional standards.

>Where is the 'glaring hole' in my data backup plan for these image files?
>
>My 'intended' burning methodologies are to burn very slowly (1x if
>possible) which in theory and personal experience gives very nice
>burns with excellent readability in multiple drives.

Even 2x seems to work well.  4x or faster is where I later run into 
drives that cannot read them.
more than once is going to mean much.  It's x months/years down the 
road that count.


Ok, +/- your paranoia...  How do you tell if the data within a file 
has degraded?  Funny thing about picture type data - stills or video 
- a few errors here and there don't mean much.  And often minor 
errors will go unreported by the drive reading the burned media.

I guess you could generate a md5 for each file...  I think one of my 
clients is doing something like this.  I'll ask 'em for the 
particulars.

- Dan.
-- 
- Psychoceramic Emeritus; South Jersey, USA, Earth

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