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February 2002, Week 2

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Subject:
Re: Sectors to Mbytes
From:
Guy Avenell <[log in to unmask]>
Reply To:
Guy Avenell <[log in to unmask]>
Date:
Fri, 8 Feb 2002 09:11:03 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (102 lines) 
From:
http://ngit2.cithep.caltech.edu/presentations/giod_status_sep97/tsld012.htm

Petabyte (1 000 000 000 000 000 bytes)
 1 Petabyte: 5 years of EOS data (at 46 mbps)
 2 Petabytes: All US academic research libraries
 20 Petabytes: Production of hard-disk drives in 1995
 200 Petabytes: All printed material OR Production of digital magnetic tape
in 1995

 Exabyte (1 000 000 000 000 000 000 bytes)
 5 Exabytes: All words ever spoken by human beings.

 Zettabyte (1 000 000 000 000 000 000 000 bytes)
 Yottabyte (1 000 000 000 000 000 000 000 000 bytes)

We are getting there.  All that data, and no time to access it.
We used to work with 1GB images in the military.  Lots of storage needs.

Guy
www.hptraderonline.com


----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, February 08, 2002 7:26 AM
Subject: Re: [HP3000-L] Sectors to Mbytes


> HP 3000 SIZING: just for fun ...
>
> Four bits = one nibble.
> Eight bits = one byte.
> The HP 3000/MPE uses 8-bit ASCII.
> Two bytes = logical word on "Classic" HP 3000s.
> Two bytes = "halfword" on PA-RISC HP 3000's.
> Four bytes = logical word on PA-RISC HP 3000's.
> 2048 bytes = one logical "page" on PA-RISC HP 3000's.
> One Kilobyte = 1024 bytes on all computers.
> One Megabyte = 1,048,576 bytes on all computers, and...
> MPE sectors are 256 bytes wide, so...
> One Megabyte = 4096 MPE Sectors (about four-thousand sectors).
> One Gigabyte = 1,073,741,824 bytes on all computers, so...
> One Gigabyte = 4,194,304 MPE Sectors (about four-million sectors).
> One Terabyte = 1024 Gigabytes on all computers, so.
> One Terabyte = 1,099,511,627,776 bytes, so...
> One Terabyte = 4,294,967,296 MPE Sectors (about four-billion sectors).
>
> Have a great weekend..
>
> Chris
> ----------
>
> Paul,
>
>         A sector is 256 bytes, so 4 sectors equal one Kilobyte or (256 * 4
> * 1024)
> = 1 Meg.
>
> Thanx,
>         Jon
>
> -----Original Message-----
> From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
> Behalf Of Paul Thompson
> Sent: Friday, February 08, 2002 8:47 AM
> To: [log in to unmask]
> Subject: [HP3000-L] Sectors to Mbytes
>
>
> I've had a brain lapse...can someone remind me of the calculation of
> converting disc sectors to megabytes...
>
> TIA
>
> Paul
>
>
> Paul Thompson
> HP3000/Ecometry Analyst
> Spark Response
> Tel: 0191 4959999 ext:5416
> Email: <mailto:[log in to unmask]>
> Website: <http://www.sparkresponse.com/>
>
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