[123019] in cryptography@c2.net mail archive
Re: It seems being in an explosion isn't enough...
daemon@ATHENA.MIT.EDU (mark seiden-via mac)
Fri May 9 20:24:35 2008
Cc: "Leichter, Jerry" <leichter_jerrold@emc.com>,
"Perry E. Metzger" <perry@piermont.com>, cryptography@metzdowd.com
From: mark seiden-via mac <mis@seiden.com>
To: "Ali, Saqib" <docbook.xml@gmail.com>
In-Reply-To: <addede3b0805091344m5cf193a0nc2041437e8d594f8@mail.gmail.com>
Date: Fri, 9 May 2008 15:56:09 -0700
i think the issue may simply devolve to lower areal density in the =20
old drives.
i.e. the bits are bigger.
does anyone know if they used encodings that were more tolerant of =20
certain kinds of errors
in the past which are less common (and so, not worth doing) than now?
On May 9, 2008, at 1:44 PM, Ali, Saqib wrote:
>> Edwards said the Seagate hard drive -- which was
>> about eight years old in 2003 -- featured much
>> greater fault tolerance and durability than current
>> hard drives of similar capacity.
>
> I am not so sure about this statement. The newer drives are far more
> ruggedized and superior in constuction. For e.g. the newer EE25 are
> designed to "operate" @
> 1) Operating temperatures of =9630=B0C to 85=B0C
> 2) Operating altitudes from =961000 feet to 16,400 feet
> 3) Operating vibration up to 2.0 Gs
> 4) Long-duration (11 ms) shock capability of 150 Gs
>
> where as the older ST9385AG:
> 1) Operating temperatures of 5=B0 to 55=B0C (41=B0 to 131=B0F)
> 2) Operating altitudes from =961,000 ft to 10,000 ft (=96300 m to =
3,000 m)
> 3) Operating vibration up to 0.5 Gs
> 4) shock capability of 100 Gs
>
>
> Source:
> http://www.seagate.com/docs/pdf/datasheet/disc/ds_ee25_2.pdf
> http://www.seagate.com/support/disc/manuals/ata/9655pma.pdf
>
> saqib
> http://doctrina.wordpress.com/
>
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