09-05-2003, 01:35 AM
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Magi
Join Date: Jul 2003
Posts: 2,049
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Usually, when something is advertised as having larger capacity, cheaper, and faster ... there is a small print hidden somewhere.
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I'm working from oft-faulty memory here, but isn't MMC a single-bit (ie serial) data bus, whereas SD supports an up-to four-bit interface?
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Ah yes, MMC is 1 bit device. MMCs only have 1 data pin (pin #7 if I am not mistaken), so in a sense, it is a serial device, but in theory, if you can clock that serial connection fast enough, it should be able to outperform a 4 bit device with a much lower clock time. |
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09-05-2003, 02:11 AM
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Intellectual
Join Date: Jul 2003
Posts: 129
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Re: New Nokia phones use MMC cards
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Originally Posted by snap
Its nice to see MMC capacity go up. Some new Nokia phones (like the 3300 Music Phone) support MMC cards but not SD cards. If SD cards are more "secure", why did a phone company choose MMC over SD? Doesn't MMC have some "content controlling" features too (say to prevent me from sharing ringtones, games, etc. with others)?
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The obvious reason to only support MMC would be that they don't have to pay royalties for MMC. If they supported SD, they would have to pay Panasonic a fee for every phone sold (maybe, but you get the point.) |
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09-05-2003, 06:03 AM
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Thinker
Join Date: Apr 2004
Posts: 342
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I have been consulting on a project with Hitachi for over a year now which involves a Secure MMC card. The prototype is out and is VERY secure. What we discovered was that SD is absolutely not secure, and the head of the project went so far as to claim the SD group was comitting fraud for making security claims (the card can be dismantled and the BUS can be accessed directly even if security is implemented). There is absolutely no advantage to using an SD card except for the fact that is can be write proteced with the external switch. As far as storage is concerned, MMC uses less overhead and is usually faster.
As far as reasons for using MMC over SD, the earlier post was correct. SD requires a royalty be paid to the SD group, MMC does not.
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09-05-2003, 08:25 AM
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Thoughts Media Review Team
Join Date: May 2002
Posts: 1,008
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hmmm this all starts to make getting a couple of (now considerably cheaper) MMC battery combos for my Jornada look like a good idea.
Thinking of the future however, (I am going to have to replace the Jornada one day  ) does an MMC card work in an SD slot?
Goldtee
__________________
...waiting for the arrival of my Axim x50v...But I still love my Newtons!
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09-05-2003, 10:52 AM
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Pupil
Join Date: Dec 2004
Posts: 24
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Quote:
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Originally Posted by dean_shan
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That is the coolest Amphibious car I've ever seen!! 8O
Err.., sorry...
In the Netherlands we have one store selling an 256Mb MMC for quite a while now, slightly cheaper than a Dane Elec 256Mb SD. It's manufactured by a very shady company called "VM", anyone ever heard of them?
check it |
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09-05-2003, 10:56 AM
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Pupil
Join Date: Dec 2004
Posts: 24
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Originally Posted by Goldtee
Thinking of the future however, (I am going to have to replace the Jornada one day ) does an MMC card work in an SD slot? |
Most SD slots are MMC compatible, however, I tried one in a Palm (M500) and no go, probably something Palm didn't want.
And an other thing: how long will MMC be around? Seems like it's fading into the background! |
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09-05-2003, 10:59 AM
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Magi
Join Date: Jul 2003
Posts: 2,049
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Quote:
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Originally Posted by mxm
In the Netherlands we have one store selling an 256Mb MMC for quite a while now, slightly cheaper than a Dane Elec 256Mb SD. It's manufactured by a very shady company called "VM", anyone ever heard of them?
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Considering the risk of future incompatibility, I will only buy an MMC if it is at least 30-40% cheaper than an SD of the same size. |
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09-05-2003, 11:09 AM
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Pupil
Join Date: Dec 2004
Posts: 24
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Originally Posted by Maximus
Considering the risk of future incompatibility, I will only buy an MMC if it is at least 30-40% cheaper than an SD of the same size.
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Exactly! Now let's hope that the price of 512 Mb card is 50% of the 512 SD card price, otherwise where's the advantage?
BTW: anyone know why a 512 SD costs 3 to 4 times as much as a 256 SD? |
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09-05-2003, 11:59 AM
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Magi
Join Date: Jul 2003
Posts: 2,049
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Quote:
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Originally Posted by mxm
BTW: anyone know why a 512 SD costs 3 to 4 times as much as a 256 SD?
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1. Economy factor. There is always be a price premium for the latest-and-greatest product. Usually this is to (a) get significant margin from the uber-technophiles who can't live without the latest-and-greatest (b) control the demand for the 512, so that it is still within production capacity, especially if it needs new set of fab machining (c) avoid canibalization of the 256, so that older machines that can only produces 256MB can still operate until their depreciation period is met.
2. Cost of miniaturization (R&D, more advanced fab processing machineries, etc.)
3. Cost Curve. When new product is launched, usually companies are using a process that is not too efficient. Months later, when new (cheaper) production method is found, automatically the price is lowered according to the newer cost structure. |
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09-05-2003, 01:46 PM
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Ponderer
Join Date: May 2002
Posts: 110
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This is most splendid news, I was worried MMC was going to crash out, I would always buy MMC and have never touched SD this speed issue is so mute, the devices I use it for just can't transfer fast enough for it too make a difference, possibly high-end cameras may show the problem, but soon MMC will catch up, as these things always do, IDE/SCSI anyone?
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