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gumby2003
 Post subject: Control Data Disk Pack
PostPosted: Tue Feb 13, 2024 3:59 pm 

Joined: Tue Aug 08, 2017 3:28 pm
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Hi,
Any one know what materials were used to make these?
Looks like the spindle has gold plating, but not tested yet.
Scrap value? Museum value?
Thanks for all comments!


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lostinlodos
PostPosted: Wed Feb 28, 2024 5:11 pm 
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Joined: Tue Feb 03, 2015 6:57 pm
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The platters are aluminium with a small amount of manganese. About 98:2 or so.

(The earliest ones were glass, so if it weighs more than a normal 3.5” hard disk whole it’s older and glass).

The platter coating is a copper ferrite with a small amount of gold. (Similar to very old magnetic tape coatings)

The spindle is aluminium.

The whole package in a long term acid bath will yield apx 2 grains of gold. Roughly $4 today. The acid costs more.


They’re slightly collectible to a small group of storage collectors but fairly common and regularly sell below $10

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