Disc rot on 5 1/2” disc

for bbc micro/electron hardware, peripherals & programming issues (NOT emulators!)
Post Reply
User avatar
Lardo Boffin
Posts: 1226
Joined: Thu Aug 06, 2015 6:47 am
Contact:

Disc rot on 5 1/2” disc

Post by Lardo Boffin » Mon May 21, 2018 11:42 am

I received a disc today and unfortunately it looks like this:-
E541A935-70B4-4266-B1E9-3B46768DDF90.jpeg
The rot (I assume it is rot) is not isolated. Anything I can do about it? I don’t want to chuck the discs.
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

User avatar
vanpeebles
Posts: 449
Joined: Wed Nov 28, 2012 10:01 am
Location: UK
Contact:

Re: Disc rot on 5 1/2” disc

Post by vanpeebles » Mon May 21, 2018 12:01 pm

You can clean it with a cotton bud and distilled water. I have a load to clean I keep putting off :lol:

User avatar
1024MAK
Posts: 7787
Joined: Mon Apr 18, 2011 4:46 pm
Location: Looking forward to summer in Somerset, UK...
Contact:

Re: Disc rot on 5 1/2” disc

Post by 1024MAK » Mon May 21, 2018 12:12 pm

I strongly recommend that you remove your jacket.
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
BeebWiki‬ - for answers to many questions...

User avatar
Lardo Boffin
Posts: 1226
Joined: Thu Aug 06, 2015 6:47 am
Contact:

Re: Disc rot on 5 1/2” disc

Post by Lardo Boffin » Mon May 21, 2018 1:06 pm

1024MAK wrote:I strongly recommend that you remove your jacket.
I’m assuming a very sharp knife is involved in this! What is the best way to reseal it afterwards?
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

User avatar
vanpeebles
Posts: 449
Joined: Wed Nov 28, 2012 10:01 am
Location: UK
Contact:

Re: Disc rot on 5 1/2” disc

Post by vanpeebles » Mon May 21, 2018 2:11 pm

Maybe he meant smoking jacket? :lol:

User avatar
Lardo Boffin
Posts: 1226
Joined: Thu Aug 06, 2015 6:47 am
Contact:

Re: Disc rot on 5 1/2” disc

Post by Lardo Boffin » Mon May 21, 2018 2:31 pm

vanpeebles wrote:Maybe he meant smoking jacket? :lol:
Never!
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

User avatar
jonb
Posts: 2210
Joined: Sat May 21, 2011 12:42 pm
Location: South Coast of England
Contact:

Re: Disc rot on 5 1/2” disc

Post by jonb » Mon May 21, 2018 4:58 pm

Nasty..

Take the disc out of the jacket as Mark says. You will probably find the inner sleeve is covered in mould. I've recently been swapping disks and jackets over to good effect - the secret with the sleeves is to try and cut where they are joined (by the fold opposite the head slot), then you can unfold, remove, refold.

Seal along the fold with black insulation tape, but you needn't bother, especially if you are recovering the data to copy to fresh disks.

User avatar
Lardo Boffin
Posts: 1226
Joined: Thu Aug 06, 2015 6:47 am
Contact:

Re: Disc rot on 5 1/2” disc

Post by Lardo Boffin » Mon May 21, 2018 7:27 pm

jonb wrote:Nasty..

Take the disc out of the jacket as Mark says. You will probably find the inner sleeve is covered in mould. I've recently been swapping disks and jackets over to good effect - the secret with the sleeves is to try and cut where they are joined (by the fold opposite the head slot), then you can unfold, remove, refold.

Seal along the fold with black insulation tape, but you needn't bother, especially if you are recovering the data to copy to fresh disks.
Thanks - I hope to try not to destroy them as they are original copies of Wasteland for the C64 and *ahem* not very cheap. I will get some practice in first - I have a few discs that won’t read so will try on them first.
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

User avatar
1024MAK
Posts: 7787
Joined: Mon Apr 18, 2011 4:46 pm
Location: Looking forward to summer in Somerset, UK...
Contact:

Re: Disc rot on 5 1/2” disc

Post by 1024MAK » Mon May 21, 2018 7:36 pm

<in a wonderful world where new disks are readily available> Discard any jackets that are affected / have the rot. Carefully clean any affected disks. I heard that plain soap helps, but not tried this. Once the disk is clean, allow to dry. Then, once completely dry, put in new jacket. Copy data off onto a new disk using a suitable disk coping system. Check new disk works. Discard old disk...</in a wonderful world where new disks are readily available>
If using a 'cleaned' disk for normal use, your mileage operational time may vary... You should try to only use such disks in a drive where the magnetic heads have resin in/over the gap, instead of heads that just have an air gap. As crud from the disk will accumulate in the gap and clog it up...

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
BeebWiki‬ - for answers to many questions...

User avatar
Lardo Boffin
Posts: 1226
Joined: Thu Aug 06, 2015 6:47 am
Contact:

Re: Disc rot on 5 1/2” disc

Post by Lardo Boffin » Mon May 21, 2018 9:39 pm

Thanks. I suspect these may be ‘for display only’ then. The data is already out there so there is no pressing need to extract it.
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

Post Reply