I totally agree.
Though the original poster was asking for opinion on a 3.5" desktop
drive, it's cheap and non-raid, so its performance is probably little
better than the cheapo 2.5" drives you're talking about and 40MB/s is
going to be about the best you can expect over FW800. A quick test of
a similar domestic Western Digital drive I have here confirms this.
The same files copied onto the same drive from the same source over
USB 2 gets me a transfer rate of 27MB/s.
So hey; FW800 sucks less in my book.
D.
On 12 May 2011 21:56, Rupert Watson <rupert@root6.com> wrote:
>
>
>
> I have never seen a single 2.5" drive of the kind you get in cheapo
> little portable enclosures get above 40MB/s on ANY connection. Be it
> USB, 400 or 800 M/bit firewire. They are all a sack when it comes to
> transfer rates but a million cheap arsed producers can't be wrong!
>
> Rupert Watson
> +44 7787 554 801
> www.root6.com
>
> -----Original Message-----
> From: Avid-L2@yahoogroups.com [mailto:Avid-L2@yahoogroups.com] On Behalf
> Of David Ross
> Sent: 12 May 2011 17:35
>
> To: Avid-L2@yahoogroups.com
> Subject: Re: [Avid-L2] External Drive for media w/ MacBook Pro
>
> Then why do I get about twice the transfer rates from the same drive
> when I use FW800, compared to USB? Same drive, same computer, same
> files, different cables. The drive is absolutely NOT slower than the
> connection.
>
> 480 Mb/s is "top speed" for USB 2, the sustained transfer rate you get
> will depend on the state of the drive (i.e. how full/fragmented it is)
> and what you are copying (i.e. lots of little files or one big file.)
> 190 Mb/s does not surprise me at all. FW400 theoretically has slower
> speed (400 Mb/s vs USB's 480 Mb/s), but, because it's designed for
> sustained transfers, will actually give better speed when you're moving
> large amounts of data around (i.e. it's better for editing.)
>
> Further reading:
> http://en.wikipedia.org/wiki/Usb#USB_2.0
> http://en.wikipedia.org/wiki/Sata#Revisions
>
> D.
>
> On 12 May 2011 17:09, bouke <bouke@editb.nl> wrote:
>
> >
> >
> > David,
> > Explain me this:
> > I'm doing a copy of 500 gig right now to a similar drive over USB.
> > I see transfer rates of about 190 Mb/s.
> > And that is 'real world' (if there is a reality in my studio, still
> > not
> > sure)
> > Now if USB is capable of 480 Mb/s, why am i running less than half the
>
> > speed?
> >
> > I can answer that, simply cause the drive is slower than the
> connection.
> >
> > Now i am the first to admit that using a 99 USD drive is not the way
> to go.
> > (My 6 TB storage set me back 8000 USD, but i have shared storage and
> > Raid
> > protected)
> >
> > But again, the physical drive itself is the bottleneck, not the
> connection.
> > No matter if you put a SATA_16 2040 UltraWide Fast 256 bits
> > "thunderbold widowmaker" connector on it.
> >
> > But it can also be my building is on old Indian burial grounds, hence
> > i don't get higher speeds than 25 MB / sec on any single drive.
> > (again, that is real world here, not specs...)
> >
> > Bouke (Who has to change a few lightbulbs now)
> >
> >
> > VideoToolShed
> > van Oldenbarneveltstraat 33
> > 6512 AS NIJMEGEN
> > The Netherlands
> > +31 24 3553311
> > www.videotoolshed.com
> > For large files:
> > http://dropbox.yousendit.com/BoukeVahl998172
> >
> > ----- Original Message -----
> > From: "David Ross" <speckydave@gmail.com>
> > To: <Avid-L2@yahoogroups.com>
> > Sent: Thursday, May 12, 2011 5:40 PM
> > Subject: Re: [Avid-L2] External Drive for media w/ MacBook Pro
> >
> > > Bouke,
> > > Maybe I'm missing your point, but I I don't see how you can say that
>
> > > USB is faster than the drive can perform.
> > >
> > > This drive is USB 2, which has a top transfer speed of 480 Mb/s.
> > > Even if the drive here is only an old revison 1 SATA, that's still
> > > 1.5 Gb/s, which is more than three times faster. More likely that
> > > it's a revision 3 SATA, which would give it 6 Gb/s, even faster than
>
> > > USB 3 (which is an option for this drive if you buy the adapter,
> > > though won't be supported on a MBP.)
> > >
> > > Personally, I would always try to avoid USB for editing from, though
>
> > > it's probably fine for simple low-res edits. For this kind of
> > > budget, you'd be much better off with a Firewire 800 drive, which
> > > would give about twice the transfer speed for very little extra
> money.
> > >
> > > D.
> > >
> > >
> > > On 12 May 2011 14:42, bouke <bouke@editb.nl> wrote:
> > >>
> > >>
> > >
> > >> even if it is USB, USB is faster than the drive can perform.
> > >
> >
> >
> >
>
If you want to donate to Red Cross quake relief, you can do so through your cell phone. Text redcross to 90999 to make a $10 donation. It will be on your next cell bill.
No comments:
Post a Comment