From: Jeff Strickland on 24 Jun 2010 18:36
"Jon Green" <jonsg(a)deadspam.com> wrote in message
> On 24/06/2010 18:42, Roland Perry wrote:
>> In message <hvvpji$gsj$2(a)news.eternal-september.org>, at 14:20:35 on
>> Thu, 24 Jun 2010, Jules Richardson <jules.richardsonnewsmoo(a)gmail.com>
>>> (and remember the days when you had to reformat the drive if you changed
>>> its orientation, as otherwise it'd start spewing out errors all over the
>>> place? :-)
>> No, I don't remember that, and I go back all the way to 1980 and drives
>> that were 10MB per platter.
> Strange. I go back as far, and I definitely do remember drives that went
> flaky when you changed them between vertically and horizontally mounted.
> And the best solution, as Jules said, was to pull off all the data,
> reformat, and restore. Didn't happen all the time by any means, but I'd
> certainly seen it occur.
I remember drives that were sensitve to changes in orientation. My DVR
claims to be sensitve to changes in orientation. My cable provider says the
DVR won't work right if it's not laying flat. My last DVR had a sticker on
it warning me that it absolutely must not be tilted or tipped -- the
difference is lost on me, but the sticker was there.
I remember that the HDD had to be set in the orientation it was to be used
in, then formatted or the formatting would not work.
From: John Rumm on 24 Jun 2010 18:48
On 24/06/2010 22:41, Andy Champ wrote:
> dennis(a)home wrote:
>> When I started they were in the 5 MB range and were 14" dia, you built
>> controllers with RLL compression and stuff like that.
>> Typically they would occupy a couple of MB1 sized cards or a bit more.
> RLL Compression? Pray tell me more.
Run length limiting. Using a RLL controller gained an extra 50%
capacity, but at the expense of a reduced signal to noise and grater
risk of unrecoverable read error.
| Internode Ltd - http://www.internode.co.uk |
| John Rumm - john(at)internode(dot)co(dot)uk |
From: Jon Green on 24 Jun 2010 19:56
On 24/06/2010 23:36, Jeff Strickland wrote:
> I remember drives that were sensitve to changes in orientation. My DVR
> claims to be sensitve to changes in orientation. My cable provider says the
> DVR won't work right if it's not laying flat. My last DVR had a sticker on
> it warning me that it absolutely must not be tilted or tipped -- the
> difference is lost on me, but the sticker was there.
I bet I know why, and the reason (in this case) is not to do with the
disk. That's a piece of living room media equipment, and the watchword
Chances are, the case was designed to convect as much heat as possible
before fan assistance, so that the fan can be either smaller and
quieter, or omitted completely. But the case design was predicated on
being horizontal, and the airflows with it vertical wouldn't purge
enough heat in time.
Not that I've played that game myself, not at all... ;)
SPAM BLOCK IN USE! To reply in email, replace 'deadspam'
Blog: http://bit.ly/45cLHw Pix: http://bit.ly/d8V2NJ
From: Roland Perry on 25 Jun 2010 02:12
In message <88hvb7F2gmU3(a)mid.individual.net>, at 21:00:23 on Thu, 24 Jun
2010, Huge <Huge(a)nowhere.much.invalid> remarked:
>> No, I don't remember that, and I go back all the way to 1980
There weren't many hard drives of the sort the public might buy, before
then. If Jules was referring to ones you'd only find in a computer room,
it wasn't an especially helpful remark to make to an end user.
>> and drives
>> that were 10MB per platter.
>Blimey. Huge capacity. There's a platter from a Xerox system hanging
>on my study wall. IIRC, the drive was 20Mb and had 5 platters. I wish
>I could remember what the capacity of the DEDS drive on the ICL 1900
>series I learned RPG2 (spit) on was. About 5 Mb (?), with two platters
>that had to be exchanged seperately, but in pairs, on a horizontal spindle
>inside a *huge* grey crackle-finish enclosure.
In mid 70's I worked on ICL drives, including something they called a
"drum", which was a single-platter mounted vertically.
My first programming (around 1968) was done on hand-punched cards, which
I preferred to paper tape as it was both easier to edit and faster to
create (I could hand-punch cards faster than the CPS of the teletype
you'd use to make the paper tape).
>Now I have 3.5 Tb of disk in mys study ...
Somewhere I have an early "PROM", you programmed it by soldering diodes
in, and the foot-square PCB probably has a couple of dozen bytes
From: Roland Perry on 25 Jun 2010 02:17
In message <i00iha$ujc$1(a)news.eternal-september.org>, at 14:24:57 on
Thu, 24 Jun 2010, Jeff Strickland <crwlrjeff(a)yahoo.com> remarked:
>I recently bought a 500G external HDD for $60. I have several Thumb
>Drives -- flash drives in some circles -- with more capacity than my first
The first computer I owned - bought new and belonging entirely to me -
in about 1975, was shipped as standard with 128bytes of memory (a 1kbit
chip arranged 128x8). But I splashed out and bought two more, so I had
384bytes to play with.