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- Path: news.dseg.ti.com!news
- From: neus@msg.ti.com (Mike Neus)
- Newsgroups: comp.sys.cbm
- Subject: Re: Too much Magnitism?
- Date: 12 Mar 1996 16:01:35 GMT
- Organization: Texas Instruments
- Message-ID: <4i474v$p5v@mksrv1.dseg.ti.com>
- References: <4hovl4$7q2@grissom.powerup.com.au>
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-
- In article <4hovl4$7q2@grissom.powerup.com.au>, mcee@mail.powerup.com.au
- says...
- >
- >Can anybodiez tell me..
- >
- >Is it Ok to keep all my disks next to a Stereo Speaker that I always
- >play loud with one of those huge thick Programmers Reference Guide
- >"Jammed" between the two as a wall?
- >
- >Is the Magnatism in a Speaker (approx. 20cm Diameter) that strong to
- >do bad for me?!?
-
- In general, it's not a good idea. In reality, it depends on a lot of
- factors, primarilly the strength of the magnet and the distance your disks
- are from it.
-
- It takes a surprising amount of magnetism to erase a tape or disk--at least
- quickly. For example, an ordinary refridgerator magnet will erase a disk,
- but you practically have to put the magenet on the disk itself. The
- thickness of a 3.5" disk's plastic shell is enough distance to save the disk
- from being erased. I just bought one of those "bulk tape erasers" from radio
- shack. It is nothing more than an electromagnet that sucks 8.5 amps from the
- wall -- a pretty darned powerfull magnet!
-
- I would guess though that prolonged exposure to fairly week magnetic fields
- (such as at a typical speaker's cabinet) probably can erase a disk enough to
- make it unreadable. Even though you may not experience a problem now, a few
- years down the road the disks closest to the speaker may begin to suffer from
- bit-rot...
-
- Best bet to be safe since you havn't gave us a magnetic field strength where
- the disks are (not that I could do anything with it) is to move either the
- speaker or the disks.
-
- -Mike Neus
-
-