RS-MMC or MMC Mobile
 

Hi,
I've read that the 770 would accept 1GB memory Card.
The only format available with this size is RS-MMC but MMC Mobile is faster IF the reader is capable ...
can the card reader in the Nokia 770 sustain the top speed of MMC Mobile & would it really make a difference ?
Should I go for the speedier smaller sized MMC Mobile or for the (?) slower bigger RS MMC ?

Thanks
Fred

on the nokia purchase page, under "suggested accessories for the Nokia 770" i saw an MMC-Mobile Card, so it *Should* Support it, as far as a noticable increase in speed, i dont know

Just got an 'Integral' brand MMC Mobile for my 770 - it says "Compatible with RS-MMC" on the blister pack.

Plugged it in and moved the Ice Age 2 trailer to the card (took about 15 secs to move the 8MB file).

Now that I have the movie playing off the card (as I type this :)), I think we have the MMC Mobile question well and truly settled. They work! :D

MMC Mobile Pro : speed (but can the 770 handle it ?)
Con : size limitation : 512 MB (RS MMC : 1 GB)

dsmudger, do you see any speed improvement on the Nokia itself?

Not sure.. can you suggest a test to benchmark the speed of the new card? The video playback was about the same - i.e. unfortunately the bundled trailer does definitley drop frames/show 'tearing' artefacts whether it's played back from internal memory or the MMC Mobile.

Seems clear this is a CPU issue though, since it took around 15secs to move - and the video content is way longer than that. I'm hoping a more efficient/optimised decoder will emerge by the power of Open Source at some point :)

Mmmmh, maybe :
- time to boot an application
- video playback (on an other video)
... That's not easy ;)

Hmm - I'm actually not too sure how you install apps on the memory card - they all go to the internal memory...

Tell you what, I'll copy the video to internal mem., then copy to the bundled card and afterwards to my new 'Integral' 512MB MMC Mobile... Can't do it now since I'm at work - can get away with the odd forum post, but poking around on the 770 is a bit too obvious as far as slacking off goes ;)

I'll report back in a bit :)

I think the easiest test would be to measure the time needed to copy a BIG file from internal memory to each card.
Thanks
O Fred

OK here goes (Ice age 2 trailer seems to be a good file since everyone will have it and be able to compare different brands of card in future - a 'reference', if you will):

Note the MMC mobile is 'Intergral' branded. I'm also /copying/ not moving - to ensure that the deletion of the original in the 'move' does not skew the results a bit :)

MMC Mobile to internal memory: 25 seconds
Internal memory to MMC Mobile: 16 seconds
(hmm - is it the read speed or the write speed that's the limiting factor here?)

Nokia RS-MMC to internal memory: 30 seconds
Internal memory to Nokia RS-MMC: 25 seconds

Well, regarding my question above in brackets... Lets find out :p
PC to Nokia RS-MMC: 22 seconds
Nokia RS-MMC to PC: 10 seconds

PC to MMC Mobile: 16 seconds
MMC Mobile to PC: 10 seconds

Now it's possible that the 770 to PC speed was limited by the USB connection - I'm using a reasonably recent Dell box - though it is remotely possible that the tech bods at my work haven't installed USB2 drivers correctly or whatever - if this is obvious from the numbers, then please let me know...


I'll leave this data up for people to discuss without drawing any conclusions myself (just yet :) ) - I'm still at work after-hours and it's time I headed off home really!

But if someone could help me out here and look up the speed of USB (remember the file is 8MB) and compare to 4/5MB /sec. that 770-to-PC transfers seem to max out at, and also do some analysis on the internal-memory-to-card-to-internal-memory figures, I'd be much obliged :D

I'm sure heated debate of the figures and/or analysis will follow! (looking forward to it :p )

Looks like MMC Mobile is a little bit faster ...

The other possible test would be to read/write from the cards connected directly to a PC (with a recent card reader) ...

Fred

OK, now when I said I'd leave the analysis to others I was expecting a little more than the blindingly obvious :p (sorry fredoll - only poking fun!)

No seriously though, I was rather curious whether people had any insight into the meaning of the figures wrt. the internal memory... at first glance it seems to perhaps be slower than MMC Mobile..?

Indeed - if people are interested (show of hands please?), I'll bring in my card reader and do some more timings...

Can you see the extra mmcMobile contacts on the 770?

http://lib.store.yahoo.net/lib/merit...mobile-pin.jpg
http://flash.atpinc.com/articles/vie...rticle_id=1186

Yes the Nokia 770 Takes MMC Mobile Cards as well
 

indeed it seems to be that the mmc-mobile cards are the same than rs-mmc cards.

also on the packaging of the mmc-mobile card it said that it is backward compatible.

so i don't trust the packages but my eyes and fingers and i have a 512 mb mmc-mobile card im my nokia 770 and it works fine.


Regards SEbastian

On the 64MByte card provided with the 770, there is the second row of contacts, thus this memory card appear to be a MMC mobile card.
However, peeking into the slot of the 770, I see only one row of contacts, thus it seems that the slot takes only RS-MMS (not the ...mobile variant).
Which - if true - would mean that the potentail max speed would be around 2.5 MB/s as opposed to the 52 (20 times) of the MCCmobile.

IceAge2 trailer is 8MB (megabyte). There is this confusion about "B" meaning bit or byte. So lets calculate them all:

8 Mega byte / 2.5 Megabyte/second = 3.2 seconds
8 Mega byte / ( 2.5 Megabit/second / 8 bit/byte) = 25.6 seconds

8 Mega byte / 52 Megabyte/second = 0.15 seconds
8 Mega byte / ( 52 Megabit/second / 8 bit/byte) = 1.2 seconds

Conclusions: since the default card (since it has all the pins) has the potential to have the highests speed, assuming that the B for transfer rates means "bit" and looking at the measured times (range 10 to 30 seconds): My conclusion is that we're on the slow side . Which means that buying MMCmobile is not necessary for the 770. But DV (as opposed to single-voltage) is necessary.

Correct me if I'm wrong.

I guess the second row of contacts is for DV cards only. While the 64MB Nokia card has two rows my 1GB RS-MMC SanDisk has only one and is single voltage. Both cards work perfectly in the 770 thus DV is not necessary.

Do the single- and dual-voltage affect the battery life differently in any way?

How interesting. The card mine came with has only one row of contacts, but indicates dual voltage on the label.

DV RS-MMC can be 7 pin. See http://flash.atpinc.com/articles/vie...rticle_id=1186

So, it appears buying mmcMobile isn't worth it if the 770 doesn't take advantage of the extra pins. I assume the extra pins are for a larger data path.

You'd better be! I've just bought a single-voltage card for my soon-to-arrive 770!

http://www.internettablettalk.com/content/view/92/2/ says you're wrong, too. Phew! :)

(Only on this small aspect, tho - nice summary on the rest of the matter :))

jc

Yep, just to confirm - I have a single-voltage 1GB RS-MMC card and it works perfectly with the 770... looks like MMC Mobile, DV RS and plain RS all work with the 770.

At the end of the day I'd say plain RS wins hands down as DV RS and MMC Mobile both seem to be more expensive and with reduced capacity compared to plain RS.

I have a hama brand single voltage card labelled "RS-MMC" and it has two rows of contacts. I have a Nokia branded dual voltage card - in the box with my 770 - and it only has a single row of contacts.

It sounds like we have seen all four combinations of (single, dual) voltage and (single, dual) rows of contacts.

Kingston 1GB MMC Mobile
 

Thanks for all the info guys! I ordered a 1GB Kingston MMC Mobile card because:
+ I'm hoping it will be faster than RS-MMC
+ I'm hoping to use it for swap space
+ Lifetime warranty
+ Kingston sells them right on their website with free shipping! $82 :D

Check it out:

http://www.ec.kingston.com/ecom/conf...1gb&referid=28

Best regards,

- Ari (...I don't work for Kingston)