🚀 go-pugleaf

In article <101195.12153942962.n@frontier.canrem.com>, Richard Whitehouse
<rwhitehouse@frontier.canrem.com> wrote:

> >The sustained performance is no mystery.  Just look at the
> 'Cuda 4LP's specs <http:>//www.seagate.com/sales/cuda/cuda4lp.html>
> >where it states (on the first line no less) that the data rate 
> >ranges from 75-120 Mbits/sec.  That roughly translates to 7-12 MBytes/sec,
> >sustained.
> 
> If it can do a sustained 12 mb/sec, I would be very surprised.  I'd
> wager that the real numbers are between 5 and 10 mb/sec.

The number quoted is the *Internal Transfer Rate* -- that's the speed the
on-board controller can deal with data coming off the heads.  The
*external* transfer rate, that is, the interface between the disks
on-board controller and the computer (SCSI or Fibre Channel for these
guys) is anywhere from 20 to 200MB/s.

jb

-----
Joseph Boykin
Principal Investigator
        Distributed Computing Systems
        GTE Laboratories, Inc.

Vice-President of Press Activities
        IEEE Computer Society

Internet: boykin@gte.com
Phone: 617-466-2803
FAX:   617-466-2137

the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
VISUAL compatible, which requires no or little THERMAL recalibration.
None of the drives in the market are AV compatible besides the Micropolis
AV series.




In article <101195.12153942962.n@frontier.canrem.com>, Richard Whitehouse
<rwhitehouse@frontier.canrem.com> wrote:

> >The sustained performance is no mystery.  Just look at the
> 'Cuda 4LP's specs <http:>//www.seagate.com/sales/cuda/cuda4lp.html>
> >where it states (on the first line no less) that the data rate 
> >ranges from 75-120 Mbits/sec.  That roughly translates to 7-12 MBytes/sec,
> >sustained.
> 
> If it can do a sustained 12 mb/sec, I would be very surprised.  I'd
> wager that the real numbers are between 5 and 10 mb/sec.

In article <nsx-2011950455130001@nsx-ppp.serv.net>, nsx@serv.net (nsx) writes:
> 
> 
> the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
> VISUAL compatible, which requires no or little THERMAL recalibration.
> None of the drives in the market are AV compatible besides the Micropolis
> AV series.

I think AV drives from other manufacturers (Conner, Seagate, 
Quantum, etc.) also delay therman calibration when the drive
is reading data (when you are burning CD with the data from
the HD).  I have not worked on CD-R but I don't think
Micropolis owns the monopoly of true AV drives in today's
market.

Jie

In article <nsx-2011950455130001@nsx-ppp.serv.net> nsx@serv.net (nsx) writes:

  the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
  VISUAL compatible, which requires no or little THERMAL recalibration.
  None of the drives in the market are AV compatible besides the Micropolis
  AV series.

Not quite.  Micropolis is the only manufacturer that has both AV and non-AV
models of the same drive, or sees a need to.

Most high capacity disk drives these days either use an embedded servo
technology to avoid thermal recalibration altogether, or have smart
algorithms which only recalibrate one head at a time and abort the tcal
operation if an I/O request comes in.  With multimedia and digital audio
and video some of the most important uses of high capacity hard drives, the
manufacturers would be crazy not to have AV compatible drives.

		Leonard

In article <nsx-2011950455130001@nsx-ppp.serv.net> nsx@serv.net "nsx" writes:

> 
> the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
> VISUAL compatible, which requires no or little THERMAL recalibration.
> None of the drives in the market are AV compatible besides the Micropolis
> AV series.
> 
Do you work for Micropolis, here is some details that I downloaded from
another group.

----------------------------------------------------------------------
- The Hawk & Cuda are rated as OK for A/V use, IIRC they both use 
  closed-loop servo recording (like IBM Ultrastar & DEC DSPXXXX series)
  which negates the need for thermal recalibration.

-- 
Julian AF Bradbury     Ergonomist; Human Factors & IT Specialist
Ergonomics & IT FAQs                  http://194.72.60.96/www/3b

----------------------------------------------------------------------
--
Rajesh Varia     raj@c4rv.demon.co.uk

In article <48qk0q$3uc@kelewan.dandelion.com>,
   "Leonard N. Zubkoff" <lnz@dandelion.com> wrote:
>In article <nsx-2011950455130001@nsx-ppp.serv.net> nsx@serv.net (nsx) writes:
>
>  the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
>  VISUAL compatible, which requires no or little THERMAL recalibration.
>  None of the drives in the market are AV compatible besides the Micropolis
>  AV series.
>
>Not quite.  Micropolis is the only manufacturer that has both AV and non-AV
>models of the same drive, or sees a need to.

Not quite either (or NQNQ for short).  I know that Seagate has now released 
what they call their ASA-II code for the Barracuda 2 and 4 GB drives.  This 
stands for Advanced System Architecture or something like that.  (At time I 
have thought it was the hidden credo of Seagate technical support, take two 
asprins and call me in the morning)

For the 2 Gb drive, this is firmware rev 0016.  It uses a different 
sector encoding scheme than earlier cuda drives.  I don't know if you can now 
order either type of Seagate (AV or non-AV) or if Seagate has made the wise 
decision to ship only the AV version since non-AV users would also like a 
screaming fast disk drive!

Doug Schmidt   Creation Technologies Inc.    Phone: 604-430-4336
doug@creation.portal.ca   BBS: 604-430-4376    Fax: 604-430-4337

Leonard N. Zubkoff wrote:
> 
> In article <nsx-2011950455130001@nsx-ppp.serv.net> nsx@serv.net (nsx) writes:
> 
>   the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
>   VISUAL compatible, which requires no or little THERMAL recalibration.
>   None of the drives in the market are AV compatible besides the Micropolis
>   AV series.
> 
> Not quite.  Micropolis is the only manufacturer that has both AV and non-AV
> models of the same drive, or sees a need to.
> 
> Most high capacity disk drives these days either use an embedded servo
> technology to avoid thermal recalibration altogether, or have smart
> algorithms which only recalibrate one head at a time and abort the tcal
> operation if an I/O request comes in.  With multimedia and digital audio
> and video some of the most important uses of high capacity hard drives, the
> manufacturers would be crazy not to have AV compatible drives.
> 
>                 Leonard

Correct.
And given the fact that NewMedia rated the Conner 2107s (2gig) and 4207s (4 gig) 
drives as being the top performers for video in their issue around 2 months ago, 
what does that do to the exclusively_micropolis theory?  I've been using the 
4207s for around 9 months (serial #s 001 and 002) and get reliable sustained 
throughput in excess of 6 megs/sec. with 16bit 44.1KHz audio - and no t-cal.

--Warren

-- 
----------------------------------------------------------------
Just the FAQs!  PC-Based Digital Recording - the Video FAQ
,__________,	3 hours VHS - on Audio recording for the PC
|          |	e-mail:	wharris@ix.netcom.com
| ()    () |	ftp: ftp.crl.com  /users/vo/voiceone  recfaq.txt
|__________|	http://www.zpub.com/z/wh/whv.html
DAWs CUSTOM BUILT TO YOUR SPECIFICATIONS!  DAL, SAW, TB, SF, ETC...

In article <30B14C1B.5E3B@ix.netcom.com> Warren Harris <wharris@ix.netcom.com> writes:

  Leonard N. Zubkoff wrote:

  > Not quite.  Micropolis is the only manufacturer that has both AV and non-AV
  > models of the same drive, or sees a need to.
  > 
  > Most high capacity disk drives these days either use an embedded servo
  > technology to avoid thermal recalibration altogether, or have smart
  > algorithms which only recalibrate one head at a time and abort the tcal
  > operation if an I/O request comes in.  With multimedia and digital audio
  > and video some of the most important uses of high capacity hard drives, the
  > manufacturers would be crazy not to have AV compatible drives.
  > 
  >                 Leonard

  Correct.
  And given the fact that NewMedia rated the Conner 2107s (2gig) and 4207s
  (4 gig) drives as being the top performers for video in their issue
  around 2 months ago, what does that do to the exclusively_micropolis
  theory?  I've been using the 4207s for around 9 months (serial #s 001 and
  002) and get reliable sustained throughput in excess of 6 megs/sec. with
  16bit 44.1KHz audio - and no t-cal.

I also picked up a Conner 4207S for my Mac/DigiDesign-based digital audio
work after reading that same article.  That article is apparently still
available at URL:

http://www.macromedia.com/Brain/New.media/Articles/Digitalvideo.html

and is definitely worthwhile reading for anyone looking at high performance
disk drives for audio/video use.

		Leonard

} In article <30B14C1B.5E3B@ix.netcom.com> Warren Harris <wharris@ix.netcom.com> writes:

}   Leonard N. Zubkoff wrote:

}   > Not quite.  Micropolis is the only manufacturer that has both AV and non-AV
}   > models of the same drive, or sees a need to.
}   > 
}   > Most high capacity disk drives these days either use an embedded servo
}   > technology to avoid thermal recalibration altogether, or have smart
}   > algorithms which only recalibrate one head at a time and abort the tcal
}   > operation if an I/O request comes in.  With multimedia and digital audio
}   > and video some of the most important uses of high capacity hard drives, the
}   > manufacturers would be crazy not to have AV compatible drives.
}   > 
}   >                 Leonard

}   Correct.
}   And given the fact that NewMedia rated the Conner 2107s (2gig) and 4207s
}   (4 gig) drives as being the top performers for video in their issue
}   around 2 months ago, what does that do to the exclusively_micropolis
}   theory?  I've been using the 4207s for around 9 months (serial #s 001 and
}   002) and get reliable sustained throughput in excess of 6 megs/sec. with
}   16bit 44.1KHz audio - and no t-cal.

I believe it was meant that Micropolis is the only manufacturer that
sells both an AV and non-AV model drive, not that other manufactures
drives are not usable for AV applications.

Tom

--

Thomas M. Buccelli (tmb@idm.com)

#include <std_disclaimer.h>

I don't work for Micropolis. i heard from many too about the AV in Micropolis.
But some said they did fine with the Barracudas... I have one of that too, will check it out...




In article <816907370snz@c4rv.demon.co.uk>, raj@c4rv.demon.co.uk wrote:

> In article <nsx-2011950455130001@nsx-ppp.serv.net> nsx@serv.net "nsx" writes:
> 
> > 
> > the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
> > VISUAL compatible, which requires no or little THERMAL recalibration.
> > None of the drives in the market are AV compatible besides the Micropolis
> > AV series.
> > 
> Do you work for Micropolis, here is some details that I downloaded from
> another group.
> 
> ----------------------------------------------------------------------
> - The Hawk & Cuda are rated as OK for A/V use, IIRC they both use 
>   closed-loop servo recording (like IBM Ultrastar & DEC DSPXXXX series)
>   which negates the need for thermal recalibration.
> 
> -- 
> Julian AF Bradbury     Ergonomist; Human Factors & IT Specialist
> Ergonomics & IT FAQs                  http://194.72.60.96/www/3b
> 
> ----------------------------------------------------------------------
> --
> Rajesh Varia     raj@c4rv.demon.co.uk

I have a seagate Barracuda 4 with a rev 0020. Does this have the AV capability?


In article <48rc6c$qj7@wolfe.wimsey.com>, dougs@portal.ca (Doug Schmidt) wrote:

> In article <48qk0q$3uc@kelewan.dandelion.com>,
>    "Leonard N. Zubkoff" <lnz@dandelion.com> wrote:
> >In article <nsx-2011950455130001@nsx-ppp.serv.net> nsx@serv.net (nsx) writes:
> >
> >  the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
> >  VISUAL compatible, which requires no or little THERMAL recalibration.
> >  None of the drives in the market are AV compatible besides the Micropolis
> >  AV series.
> >
> >Not quite.  Micropolis is the only manufacturer that has both AV and non-AV
> >models of the same drive, or sees a need to.
> 
> Not quite either (or NQNQ for short).  I know that Seagate has now released 
> what they call their ASA-II code for the Barracuda 2 and 4 GB drives.  This 
> stands for Advanced System Architecture or something like that.  (At time I 
> have thought it was the hidden credo of Seagate technical support, take two 
> asprins and call me in the morning)
> 
> For the 2 Gb drive, this is firmware rev 0016.  It uses a different 
> sector encoding scheme than earlier cuda drives.  I don't know if you can now 
> order either type of Seagate (AV or non-AV) or if Seagate has made the wise 
> decision to ship only the AV version since non-AV users would also like a 
> screaming fast disk drive!
> 
> Doug Schmidt   Creation Technologies Inc.    Phone: 604-430-4336
> doug@creation.portal.ca   BBS: 604-430-4376    Fax: 604-430-4337

In <48rc6c$qj7@wolfe.wimsey.com>, dougs@portal.ca (Doug Schmidt) writes:
>In article <48qk0q$3uc@kelewan.dandelion.com>,
>   "Leonard N. Zubkoff" <lnz@dandelion.com> wrote:
>>In article <nsx-2011950455130001@nsx-ppp.serv.net> nsx@serv.net (nsx) writes:
>>
>>  the only AV-drives is from MICROPOLIS. The word AV means it is AUDIO
>>  VISUAL compatible, which requires no or little THERMAL recalibration.
>>  None of the drives in the market are AV compatible besides the Micropolis
>>  AV series.
>>
>>Not quite.  Micropolis is the only manufacturer that has both AV and non-AV
>>models of the same drive, or sees a need to.
>
>Not quite either (or NQNQ for short).  I know that Seagate has now released 
>what they call their ASA-II code for the Barracuda 2 and 4 GB drives. 
 
The IBM Ultrastar series of drives fits into the AV (no thermal recal) 
category as well.

Mark Schultz [mschultz@watson.ibm.com] or [mds@henry.ece.cmu.edu]                                                                             
Guitar, Sound Engineering, Ultimate, SFB, Corvettes, Magnetics, and The Lord
Jesus Christ.  NOT in that order.  This .SIG subject to change at any time.

In message <48vgbr$tnm@watnews1.watson.ibm.com> - mschultz@watson.ibm.com 
(Mark Schultz) writes:

:>Mark Schultz [mschultz@watson.ibm.com] or [mds@henry.ece.cmu.edu]                                                                             
:>Guitar, Sound Engineering, Ultimate, SFB, Corvettes, Magnetics, and The Lord
:>Jesus Christ.  NOT in that order.  This .SIG subject to change at any time.

  Just add Pot Smoker to your enumeration and you'll admirably
  fit the bill in that other thread in this newsgroup.

  By the way...  I'd leave that order alone.

    Chris

In article <491qrj$f7n@news.siemens.at>, Martin Grecner
<Martin.Grecner@siemens.at> wrote:

> Quantum Atlas II are very good drives for AV applications, for example.
> They not only use embedded servo control to avoid a need for thermal 
> recalibration, they also have 1MB(2MB for the 4GB drive) of segmented 
> cache, which means that if you'reading more files at once (like 8 tracks 
> of audio), they all get their place in the cache.
> 
>                                 Martin Grecner

Where did you get the Atlas II?  I have not been able to find them for sale.

Why *do* Micropolis make two versions of the 4GB drive? The price 
difference between the two is relatively negligible, about 50UKP.
-- 
David Longley