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From: Rob on 16 May 2010 15:04
On 16/05/2010 20:00, Jaimie Vandenbergh wrote:
> On Sun, 16 May 2010 19:06:21 +0100, info(a)that.sundog.co.uk (SM) wrote:
>
>> Rob<patchoulianREMOVE(a)gmail.com> wrote:
>>
>>> I've just ripped some DVDs to disk using Handbrake. Using an i5 2.66
>>> iMac it encodes at about 90fps; using a C2D 2.4 iMac about 30fps. Same
>>> disk and encoding settings (normal default).
>>>
>>> I hadn't expected the performance difference to be that great - does it
>>> look about right?
>>
>> Quick question - does your iMac 27" scratch discs?
>>
>> Of three i5s which I bought one scratches DVD/CDs badly. This isn't
>> cackhandedness but something inside isn't right. It's twatted the
>> install discs for Final Cut Studio and Logic Studio which is a lot of
>> DVDs :-(
>>
>> Googling suggests a problem exists but it's clouded by the possibility
>> of pulling/pushing discs against the aluminium slot.
>
> Mine doesn't, though it's only had about five disks in it since I got
> it. Three were 4+gig DVDs being burnt, so had full traversal of the
> platter.
>

Mine neither that I've noticed. There's a recent thread about this on
the Apple Discussion boards.

Rob

From: Duncan Kennedy on 16 May 2010 16:25
SM <info(a)that.sundog.co.uk> wrote:

> Rob <patchoulianREMOVE(a)gmail.com> wrote:
>
> > I've just ripped some DVDs to disk using Handbrake. Using an i5 2.66
> > iMac it encodes at about 90fps; using a C2D 2.4 iMac about 30fps. Same
> > disk and encoding settings (normal default).
> >
> > I hadn't expected the performance difference to be that great - does it
> > look about right?
>
> Quick question - does your iMac 27" scratch discs?
>
> Of three i5s which I bought one scratches DVD/CDs badly. This isn't
> cackhandedness but something inside isn't right. It's twatted the
> install discs for Final Cut Studio and Logic Studio which is a lot of
> DVDs :-(
>
> Googling suggests a problem exists but it's clouded by the possibility
> of pulling/pushing discs against the aluminium slot.
>
My Mini has just done that with my new Apperture disk. Seemed Ok going
in but, fortunately, the scratch damaged sample files only. I did
notice something on the scratch which cleaned off. The drive has onbly
been used a few times.


--
duncank
From: SM on 16 May 2010 18:04
Jaimie Vandenbergh <jaimie(a)sometimes.sessile.org> wrote:

> >Of three i5s which I bought one scratches DVD/CDs badly. This isn't
> >cackhandedness but something inside isn't right. It's twatted the
> >install discs for Final Cut Studio and Logic Studio which is a lot of
> >DVDs :-(
> >
> >Googling suggests a problem exists but it's clouded by the possibility
> >of pulling/pushing discs against the aluminium slot.
>
> Mine doesn't, though it's only had about five disks in it since I got
> it. Three were 4+gig DVDs being burnt, so had full traversal of the
> platter.
>
> It may to be easy to tell the difference between drive internals and
> externals (that alu slot) being scratchy - internals will cause curved
> tracks following a circle centred on the hole as the disk is spinning,
> while externals will be straight lines. The rollers that bring the
> disk in count as externals for this, mind...

On the first DVD-R disc I noticed had a problem there were about seven
curved deep scratches. Since Final Cut and Logic installed I'm guessing
the scratching happens on eject.

The slot is perfectly smooth but you can't see in beyond the fabric
which closes the slot to keep out dust.

Stuart
--
cut that out to reply
From: SM on 16 May 2010 18:11
Duncan Kennedy <nospam(a)nospamottersonbg.couk> wrote:

> > Of three i5s which I bought one scratches DVD/CDs badly. This isn't
> > cackhandedness but something inside isn't right. It's twatted the
> > install discs for Final Cut Studio and Logic Studio which is a lot of
> > DVDs :-(
> >
> > Googling suggests a problem exists but it's clouded by the possibility
> > of pulling/pushing discs against the aluminium slot.
> >
> My Mini has just done that with my new Apperture disk. Seemed Ok going
> in but, fortunately, the scratch damaged sample files only. I did
> notice something on the scratch which cleaned off. The drive has onbly
> been used a few times.

Could you check the model of your mini's drive?

Stuart
--
cut that out to reply
From: Rowland McDonnell on 17 May 2010 03:30
Rob <patchoulianREMOVE(a)gmail.com> wrote:

> I've just ripped some DVDs to disk using Handbrake. Using an i5 2.66
> iMac it encodes at about 90fps; using a C2D 2.4 iMac about 30fps. Same
> disk and encoding settings (normal default).
>
> I hadn't expected the performance difference to be that great - does it
> look about right?

Yep.

2.2x faster based on ticks per CPU core only.

More efficient architecture around the CPU.

More efficient inside the CPU.

That's what gives you the extra extra to take the increase up from 2.2X
to 3X (a factor of 1.35).

Put it like this: what you're seeing is that the newer iMac's 35% more
efficient than the older iMac, as well as having a faster ticking CPU
and more CPU cores.

Rowland.
--
Remove the animal for email address: rowland.mcdonnell(a)dog.physics.org
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