Author Topic: Harddrives - nice pictures  (Read 1233 times)

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Offline Noopy

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Harddrives - nice pictures
« on: May 14, 2019, 09:10:16 pm »
Hi all,

I did some high resolution pictures of two old WD Caviar harddrives (22100 and 22500).



Of course with some die Pictures too.  8)



If you are interested go to:
http://www.richis-lab.de/HDD_WD_Caviar_22100.htm
http://www.richis-lab.de/HDD_WD_Caviar_22500.htm

Text is german...  :scared: ;D

Have fun! :popcorn:

Greetings,

Richard
 
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Offline simxdx

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Re: Harddrives - nice pictures
« Reply #1 on: May 15, 2019, 12:39:50 am »
 :-+,Very clear pictures!
 

Online Miyuki

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Re: Harddrives - nice pictures
« Reply #2 on: May 15, 2019, 04:46:44 am »
Nice pictures  :-+

Wonder how much tinier is reading head now in Terabyte sizes and how weak signal it produces compared to back then
 

Offline Noopy

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Re: Harddrives - nice pictures
« Reply #3 on: May 15, 2019, 05:08:21 am »
Thanks!  8)

I have some newer models lying around here.
Coming soon...  :-/O

I don´t know if you can compare the signals of an old device to a newer one. The technology changed a lot as far as I´m informed...
 

Offline pwlps

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Re: Harddrives - nice pictures
« Reply #4 on: May 15, 2019, 11:37:43 am »
Wonder how much tinier is reading head now in Terabyte sizes and how weak signal it produces compared to back then

The signal is not so much smaller, in fact it was rather the progress in the reading head technology (AMR,GMR,TMR...) giving more signal strength that allowed increasing areal density.  For example the development by IBM of new heads based on the GMR effect in the 90's allowed to break the technological limitations of the previous AMR generation  (still used in WD Caviar models, WD acquired the GMR technology from IBM circa 1998).
 

Online Miyuki

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Re: Harddrives - nice pictures
« Reply #5 on: May 15, 2019, 03:14:28 pm »
Wonder how much tinier is reading head now in Terabyte sizes and how weak signal it produces compared to back then

The signal is not so much smaller, in fact it was rather the progress in the reading head technology (AMR,GMR,TMR...) giving more signal strength that allowed increasing areal density.  For example the development by IBM of new heads based on the GMR effect in the 90's allowed to break the technological limitations of the previous AMR generation  (still used in WD Caviar models, WD acquired the GMR technology from IBM circa 1998).
I know most of the capacity progress is trough narrower more dense packed tracks as speed and linear density goes up no more than 10 times from that 90s drives but total density skyrocketed and have exponential growth
But still they must now processing signal in GHz ranges from head as they get about 200MB/s data rate
 

Offline dom0

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Re: Harddrives - nice pictures
« Reply #6 on: May 16, 2019, 04:25:51 pm »
Interesting.



This kinda reminded me of Hebrew, though it doesn't seem to correspond directly to the Hebrew alphabet. And IBM did do both semiconductor and disk drive research in Haifa.

If you flip it (attached) it looks very much like a stylized kind of Hebrew.
« Last Edit: May 16, 2019, 05:28:08 pm by dom0 »
,
 
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Offline Noopy

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Re: Harddrives - nice pictures
« Reply #7 on: May 16, 2019, 06:32:07 pm »
My first opinion was also hebrew.

Interesting idea to flip the symbols.  :-+
 

Offline Noopy

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Re: Harddrives - nice pictures
« Reply #8 on: June 23, 2019, 02:46:17 pm »
Hi all!

I have posted some new pictures. This time a hard disk with a GMR-Head.   \$\Omega\$ :-/O



Whole story here:
http://www.richis-lab.de/HDD_Samsung_SV4003H.htm

Have fun! :popcorn:


...perhaps you are interested in a floppy drive too:
http://www.richis-lab.de/floppy.htm
Eventually very similar just bigger...  ;D
 

Offline Noopy

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Re: Harddrives - nice pictures
« Reply #9 on: September 20, 2019, 08:23:55 pm »
News on my homepage: A Western Digital Red 3TB

https://www.richis-lab.de/HDD_WD_RED_3TB.htm





Piezos in the pick up and heaters in the head. What a crazy shit. :wtf:


A interesting thing:

Till now I had two WD Red 3TB with bad SMART values.

The boards in both hard disks seem to have a corrosion problem:



In my opinion they use galvanic silver. Cheap and good with BGA but problematic regarding corrosion.
Very bad when you want ot use spring contacts for very fast signals:



I would have chosen gold!  8)


Have fun!  :popcorn:
« Last Edit: September 21, 2019, 06:21:06 am by Noopy »
 
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