[BBC-Micro] Fw: DD & HD Floppies

Bob Devries devries.bob at gmail.com
Sun Oct 17 10:25:17 BST 2010


Dave,

I think that neither of the floppy disc chips used in the BBC are capable of 
the double data rate.

Regards, Bob Devries

----- Original Message ----- 
From: "Dave Curran" <bbc at pdcurran.co.uk>
To: <bbc-micro at lists.cloud9.co.uk>
Sent: Sunday, October 17, 2010 6:36 PM
Subject: Re: [BBC-Micro] Fw: DD & HD Floppies


> Silly question, but I'm just taking a step back from this and thinking 
> that
> instead of adapting HD disks to work in DD drives, what are the chances of
> getting standard 1.44M HD drives to work on the BBC?
>
> There are probably good reasons why this hasn't happened, just wondering 
> if
> any of them weren't insurmountable. I know there are likely to be issues
> with the smaller heads used in HD drives when writing DD disks to be read 
> on
> DD drives, the same sort of issues that causes all the fun with 40 track
> disks written by 80 track drives. Are there also issues with catalogue 
> sizes
> or track counts?
>
> The ideal would be adapting one of the DFS's to work with 1.44M disks -
> unless any of them do already? Otherwise some hardware mod to use HD 
> drives
> and disks as if they were DD drives and disks. Double all the track steps
> and perhaps even repeat every write on the next track to increase the
> chances of DD compatibility?
>
> Just a thought?
>
> Dave
>
> On 17 October 2010 05:33, Rick Murray <rick at rs432.net> wrote:
>
>> On 17/10/2010 06:19, Kieran Mockford wrote:
>>
>> > http://www.floppydisks.com
>>
>> Nice to see somebody still keeping the floppy alive. But, what, no 8"?
>> <giggle>
>>
>>
>> > There doesn't seem to be anything that indicates that they won't ship 
>> > to
>> > that side of the pond (this side gets free shipping, though!).
>>
>> I went to perform a pretend-purchase of 20 5.25s to see what sort of
>> shipping would be involved. The site tries to pass you over to Google
>> Checkout, at which point NoScript put its foot down:
>> --8<--------
>> [NoScript XSS] Sanitised suspicious upload to
>> [
>> https://checkout.google.com/api/checkout/v2/checkoutForm/Merchant/655251604398233
>> ]
>> from [http://www.floppydisks.com/view_cart.php]: transformed into a
>> download-only GET request.
>> --8<--------
>>
>> Funny. The place I get Japanese food from works fine with its bank, my
>> geek-bits site works fine with its banking service. Hell, even EDF works
>> when it passes you all over the place. But this one triggers NoScript.
>> Probably okay, but I'm paranoid when it comes to my credit card info and
>> the Internet... and if they can't get this itty-bitty detail right.....
>>
>>
>> Best wishes,
>>
>> Rick.
>>
>> --
>> Rick Murray, eeePC901 & ADSL WiFI'd into it, all ETLAs!
>> BBC B: DNFS, 2 x 5.25" floppies, EPROM prog, Acorn TTX
>> E01S FileStore, A3000/A5000/RiscPC/various PCs/blahblah...
>>
>>
>>
>> _______________________________________________
>> bbc-micro mailing list
>> bbc-micro at lists.cloud9.co.uk
>> http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro
>>
>


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