Number of heads on hard drives lies...

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Post Reply
User avatar
Externet
Posts: 1853
Joined: Fri Feb 01, 2002 1:01 am
Location: Mideast USA
Contact:

Number of heads on hard drives lies...

Post by Externet » Fri Jan 26, 2007 5:46 pm

Hi all.
From day one, the hard drives had a number of heads corresponding to each active surface of the disc platters spinning in them.

Since a long while, ago, I noticed the specifications lie, by saying such-such model hard drive has "16 heads, such # cylinders, etc. "
But when opening the drive, there is only a couple of platters, sometimes with only three heads. The specs still insist on a greater number.

Why this false statement ?

Miguel

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Post by Chris Smith » Fri Jan 26, 2007 8:15 pm

Im no expert here but possibly a “Headâ€

Newz2000
Posts: 507
Joined: Wed May 18, 2005 1:01 am
Location: Des Moines, Iowa, USA
Contact:

Post by Newz2000 » Fri Jan 26, 2007 9:44 pm

Use a tool such as Spinrite to check the real geometry. Commonly the number is faked in order to trick the computer into seeing the right capacity.

I could be wrong, but I remember the day of 5 -8GB hard drives, all kinds of tricks were used to get the numbers to come out right.

User avatar
Edd
Posts: 885
Joined: Sun Jan 27, 2002 1:01 am
Location: Dallas Tx
Contact:

Post by Edd » Sat Jan 27, 2007 2:33 pm

.

From the mechanical aspect:
The use of multiples within ONE mechanical housing is what is done. The drive mechanics "scoots" right across
a platter, but the transfer of info is even quicker in the selections of different partitions of the head.
Here is a blow up..up to the point that pixelation just starts to infringe upon greater definition.
Take note of the "large" external loose wiring harness interfacing into the head propers connections.

Image


As for the wire used on those head windings, in a comparative dimensional scale , a human hair may look GIGANTIC.

73's de Edd
[email protected] ...........(Interstellar~~~~Warp~~~~Speed)
[email protected]..........(Firewalled*Spam*Cookies*Crumbs)
:grin: :razz: :grin:

When everything comes in your way, you're in the wrong lane.

.

Dean Huster
Posts: 1263
Joined: Wed Dec 05, 2001 1:01 am
Location: Harviell, MO (Poplar Bluff area)
Contact:

Post by Dean Huster » Sat Jan 27, 2007 3:46 pm

...but I remember the day of 5 -8GB hard drives...
Holy cow! 5GB? It seems like yesterday when the Intel 4004 was invented. Back then, small computers occupied a half-rack and you were amazed at the storage capacity of an 8-inch floppy.

Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).

R.I.P.

Newz2000
Posts: 507
Joined: Wed May 18, 2005 1:01 am
Location: Des Moines, Iowa, USA
Contact:

Post by Newz2000 » Sat Jan 27, 2007 5:46 pm

Dean Huster wrote:Holy cow! 5GB? It seems like yesterday when the Intel 4004 was invented. Back then, small computers occupied a half-rack and you were amazed at the storage capacity of an 8-inch floppy.
Well, I did have a TRS 80 (coco2) that had a cassette tape drive, but Dean, you have to admit, 5GB made it mainstream around '96, which is 11 years ago. We now throw away tech stuff after 18 months, so that's kind of like your current computer's great-great-great grand-pappy.

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Post by Chris Smith » Sat Jan 27, 2007 6:30 pm

I remember the fantastic advantage of TWO 360k floppies, one for the CPU/ DOS program and the other to work with.

Bill was still avoiding college!

Now I just sold a 500 gig back up disk and its not even the biggest thing out there?

Post Reply

Who is online

Users browsing this forum: No registered users and 40 guests