[help:] MMC vs SD - PDA2, XDA IIi, 2020i General

Hi everyone,
I'm confused which card is more compatible for O2 XDA IIi (Alpine) apart from the brand ?
is it:
SD
or
MMC / MMC+ / MMC Dual Voltage ?
Thanks

AFAIK both SD and MMC card works for the xda2i?alpine.though you have to buy a card with a fast write/read speed.

As far as I know (bar the voltages) the only difference between SD & MMC is that the MMC card does not have a 'write protect' sliding tab, whereas the SD cards do.
Joe Pinball
P.S. first post!
P.P.S. still waiting to get my Alpine!

Here is the data I've found from Kingston website:
<h3>SD</h3>
Secure Digital, introduced in late 2001, is a second-generation and more popular
derivative of the MultiMediaCard (MMC) standard (see section 7.4) that is backwardcompatible
with current MMC cards.
The Secure Digital format includes several important technological advancements over
MMC. These include the addition of cryptographic security protection for copyrighted
data/music and a 4X increase in data transfer rates. The SD Card Association sets the
specifications for Secure Digital cards.
To help support higher-capacity cards, SD cards are slightly thicker than the original
MMC cards. This means that devices designed to support SD cards may also accept
MMC cards (if the host device is not strictly limited to SD media for data security
reasons). However, devices exclusively designed for MMC cards will not support the
thicker SD cards at this time.
<h3>MMC</h3>
MultiMediaCards are one of the smallest Flash cards available, about the size of a
postage stamp. They were introduced in 1997 and initially used in the mobile phone
and pager markets. Today, they are commonly used in digital cameras, mobile phones,
and MP3 players. The MultiMediaCard Association sets the specifications for MMC.
Finally, the best option would be the SD card for the Expansion based on the speed.
thanks mate.

SD is MMC with data encryption (hence Secure Digital). Supposed to stop unauthorised copying, etc - but I don't think it's a defaulted feature, how else would you be able to read your own data when you swap cards between devices
SD has a much faster read/write rate than MMC, although the latest generation of MMC cards are faster than SD. However, they're also more expensive, and I'm not sure if they're full compatible with existing SD equipment (although MMC and SD are cross-compatible, so who knows... If you want to buy an MMC+ card and trial it, fine by me ).
Based purely on a weigh-up of cost vs. speed, SD is the more viable option at the moment.

According to the Kingston website, the MMC+ cards will work with the I-Mate PDA2.
It also states that the max size for any card is 1GB though???????
Who wants to put them straight?

wooww thank you very much indeed my friends.
now i really understand the difference.
this forum is ROCKZZZ !!!

Related

What is the largest SD card that can be used in an XDAIIi?

Hi,
A simple question but I couldn't find it categorically written down anywhere: What is the largest SD card that can be used in an XDAIIi?
Thanks a lot,
James.
Im not sure i know of any limit, but its worth noting that only a Transcend 80x SD card works properly and as far as i know they go up to 1gig.
Any other card (non 80x) causes problems with the XDA IIi and causes it to hang.
Thanks for the info. I've been using San Disk 256Mb cards for a while which seem to work fine (although one did get confused once and thought it contained stuff when it didn't so had to be reflashed).
I'll stick to Transcend when buying a new bigger one.
Thanks,
James.
Danny-B- said:
Im not sure i know of any limit, but its worth noting that only a Transcend 80x SD card works properly and as far as i know they go up to 1gig.
Any other card (non 80x) causes problems with the XDA IIi and causes it to hang.
Click to expand...
Click to collapse
That is not universally true. I have been using a SanDisk 1.0 GB Ultra II SD card in my XDA IIi for a number of months with no problems whatsoever.
Yeah, in fact i'd go sa far as to say it's not true, I'm using an Integral 60x 1Gb card and have not had any problems whatsoever.
The only problem I have found is that with 1gb cards the XDA2i seems to have a problem when accessing the card and accepting incoming communication at the same time e.g, reading the memory card whilst accepting a call or accessing GPRS. The phone seems to cut power/access to the memory card (disconnects it)and therefore makes the phone hang/freeze. This does not seem to be an issue with 512mb or lower sized cards only 1gb and above. I have tried many different brands and this seems to hold true. For SATNAV applications people advise 512mb cards or lower work best. Again this I have found to be with card accessing issues and 1gb+ cards seem to lose connection, admittedly some cut off slightly faster than others. I use a gb card for most of my apps, but if running TomTom I swap in a 256mb.
ok perhaps i shouldnt have said ONLY transcend cards but i was just trying to highlight that i know that they work fine in the XDAIIi.
Yes there are going to be more brands that work fine too, as far as i know its a voltage issue, anyway im not a htc technician so thats as far as my knowledge goes
I'm using a SanDisk Ultra II 2.0GB card with no problem at all in my Qtek 2020i with O2 rom
I have been doing some reserch into SD Cards because of this problem.
It seems to do with the layers in the card. If the card is of good quality and is a single layer they seem to work OK, if it is dual layer you could have problems.
It has everything to do with current to the card and little to do with card speed.
Single layer cards of high storage capacity are more expensive to produce, because of this even the big brands use dual layer cards.
Interesting stuff about the layers. Thanks for the info.
Has anyone tried the San Disk Ultra II Plus which is the one that can be folded so it can be plugged directly into a USB port too? They look really useful (although are hard to find at the moment at a decent price) as it means you have both USB flash memory and SD combined which I'd find useful when travelling.
Re: Single layer cards
Does anyone know the brands other than Trancsend who use the Single layer card build?
Thx
i'm using a 2GO Maxell SDcard X150 and it works fine.
no pb at all
http://www.maxell.fr/Maxedhd/Sd%20Card/SDcard%202%20go%20(300%20dpi).jpg
I have 150x A-Data 2Gb. All is ok too...
I have a no-name 2 Gig crd and no issues (£84 from Novatech). Actually, 1 issue, bloody XDA locks up when removed from cradle more often than not & needs a soft reset. Other than that, zero probs...

Where do you recommend for tom tom?

Ive been thinking of getting tom tom for my xda2i, can anyone give me any advice on where to buy this with all the stuff that i need? I would like advice from anyone who has bought tom tom for their alpine and how much i would be looking to pay. Thanks in advance for help.
ArgyleMoss,
If you intend in getting TomTom for your XDA IIi, make sure that you get an MMC card and NOT an SD Card!
Lots of issues with TomTom locking up with SD cards (even Transcend 80X)
ArgyleMoss,
If you intend in getting TomTom for your XDA IIi, make sure that you get an MMC card and NOT an SD Card!
Lots of issues with TomTom locking up with SD cards (even Transcend 80X)
ok i'm gonna sound thick here but what is the difference between a mmc and sd card please
The size/shape of the MMC Card and the SD Card are identical.
Maximum transfer rates of SD are faster than that of MMC.
SD cards have a thicker casing and are more durable and resistant to electrostatic discharge.
SD includes a small switch on the side of the card that has two settings: Locked and Unlocked. If you set the card to the locked position, devices will not be able to write to the card, erase data from the card, etc.
Not sure, but the MMC may require less power to work and as a result work fine with XDA IIi (known issue with power to SD cards)
I bought a Kingston 2 GB sd ELITE PRO, and it seems to work just fine. I made some research and this specific model, it is an SLC (single layer cell) memory. These kind of memory need less power like MMC and they should work fine with tomtom.
I bought a Kingston 2 GB sd ELITE PRO, and it seems to work just fine. I made some research and this specific model, it is an SLC (single layer cell) memory. These kind of memory need less power like MMC and they should work fine with tomtom.
thanks for that about sd and mmc cards, but where do you recommend buying the tom tom kit for xda2i. thanks

Does a 4GB SD-Card work in Alpine??

Hey guys I`ve bought an Alpine and I want to put a 4GB SD Card in it??
Do you think, it works? Or is the maximium 2 GB, which works in Alpine?
CU
4 gb cards work......mostly.
I've used both the A-Data and the Transcend 4 GB cards on my Alpine. There is only one problem I've experienced. If your 4 GB card is less than half full (i.e. available storage is > 2gb), AND you've configured your camera to save the pictures you take to the SD card directly, then you may experience an error. The error simply says it can't save the SD card. If you card is more than 50% full of other stuff, then there is no problem using the camera application and saving your picutres directly to the SD Card.
I RARELY use my camera, so I really don't care. Plus, I have enough stuff on my SD card so that it never has more than 2 gb of available storage (i.e. its always more than half full). Consequently, this bug in the camera application is really not much of a nussiance.
ok, thank you very much for your reply...
It work, as I had a Kingston 4GB SD Card
without problems??
can you give me some more details about your sd card??
thank you
A 4Gb will work, but it does depend on the make - since, I'm guessing, cheaper makes use cheaper parts. Kingston and SanDisk seem to be pretty good.
I have a generic (samsung oem perhaps?) 4gb SD card and it works fine apart from it seems to be a tight fit in the slot. No problems with it as yet though.
SD card
I used a topram 4GB mini with adaptor and it did not work.
I then bought a Transcend 4GB MMC+ (plus) and it works like a dream.
I hope this helps you.
Watch out that the card is not a sdhc card. SDHC cards look like normally sd cards, but they dont' work on the Alpine.
pbohemien said:
Watch out that the card is not a sdhc card. SDHC cards look like normally sd cards, but they dont' work on the Alpine.
Click to expand...
Click to collapse
all sdhc (high capacity) cards have "sdhc" sign so you can easily discern them
only the newest htc devices support sdhc cards
I'm using 4GB Tanscend SD Card with my alpine
and its working fine
Thanks to the advice here, I bought a 4Gb Transcend MMC plus and it works beautifully.
So much space is a real bonus as I have Tomtom maps of Europe, the whole of the USA, 6 or 7 full movies plus 20 or so albums worth of mp3's still with 500mb free for odds & sods.
Hi,
I am using a HAMA 4GB, and it is working more or less fine.
I don't know if it is a card issue or caused by the heat recently in Austria, but my Nav freezes from time to time.
I have to turn the 2020i off and then on, then it works again.
Some days ago, the card suddenly lost some data....
I have a SanDisk 4GB SD Card, however when I put it into my Alpine it doen't seem to recognise it. It just doesn't show up. Can anyone give me any hints on how to force it to look for it or something like that?

4/8 GB SDHC fix for Alpine

Has anyone seen a SDHC fix for 4/8 GB SD Cards available for Alpine?
Anybody tested a fix?
If HTC has a box with SDHC compatible, then there must be a fix for it.. Or maby soneone can help us to make that registry fix and new files required for the fix..
4GB SD cards work as standard on the Alpine anyway no fix required as long as they are fast, the 4Gb Topram SD in mine is a 150x and works like a dream. I have no Idea if an 8gb works but if it conforms to the standard then it might- 4gb is enough for me
Compatibility issues with 2 GB and larger cards
from: http://en.wikipedia.org/wiki/Secure_Digital_card
Compatibility issues with 2 GB and larger cards
Compatibility with 2 gigabyte and larger SD cards has been poor, due to the SD/MMC protocol's using a 32-bit address field denominated in bytes. The SDHC standard addresses this limitation by using 32-bit block addresses instead. Both SD and SDHC are traditionally accessed as 512-byte blocks on 512-byte boundaries, so the change to host software or firmware is minor but required. Before SDHC was standardized, various manufacturers "extended" the SD control block fields for their 2 GB and 4 GB cards in different ways. Those cards are incompatible with many SD and some SDHC devices, as they conform to neither standard. All SDHC readers work with standard SD cards.[SD Compatibility, CARDSPEED - Card Readers and Memory Cards, December 1, 2006]
Many older devices will not accept the 2 GB size even though it is in the revised standard. The following statement is from the SD association specification:
"To make 2 GByte card, the Maximum Block Length (READ_BL_LEN=WRITE_BL_LEN) shall be set to 1024 bytes. However, the Block Length, set by CMD16, shall be up to 512 bytes to keep consistency with 512 bytes Maximum Block Length cards (Less than and equal 2 Gbyte cards)."[SD Group Technical Committee (September 25, 2006). "Section 4: SD Memory Card Functional Description; 4.3.2: 2 Gbyte Card", SD Specifications, Part 1: Physical Layer Simplified Specification (PDF, HTML), Version 2.00, SD Card Association, p. 19. Retrieved on 2007-02-23. ]
Since all cards up to and including the 1 GB card use a fixed 512 block size, some device drivers do not handle the larger block size and will not even recognize the 2 GB card. For example, the SanDisk web site shows examples of devices such as the iPAQ 1910 that will support only 1 GB cards and the Epson Photo RX300 Technical support says they support only 1 GB cards in the SD slot. Users of many early card readers have found that they also support only cards up to 1 GB.
Click to expand...
Click to collapse
As I can not afford to buy a non-standard and non supported card here in Turkey, I am searching for a legit fix. I haf my Kingston replaced twice due to a problem. In other brands, I simply could not do this. That'a why I am looking for a working fix.. But thanks for notifying...
i had probs with 2gb cards but then i found if its formated as standard FAT (FAT16) not FAT32 they work fine.

Micro SD card speed

Does the speed of the card determine the transfer speed between the Phone and PC or within the Phone itself?
I'm wondering if it's worth the extra 20 to get a class 6 over a class 4.
This has been discussed before. The phone dictates the data transfer speed between the PC and SD card.
So what transfer speed does the Nexus One dictate?
Well..when tommyarmour and I were discussing this in his thread a month ago..neither of us got more than 2mb/s or so using class 4 and 6 cards. Plugging my class 6 directly into my computer's card reader got me over 6.5mb/s.
There are 2 distinct things about SD card performance:
1) If one roots and uses APP2SD method, where N1 stores apps on an EXT* partition on on the _card_ , instead of its own, built-in and very limited flash storage, then one would probably want faster performing card so that apps load faster. Especially if you have a game with tons of textures/scenery
2) Unrelated to #1, faster cards should allow faster transfer rates from one's computer to the N1's SD card - so when you have large music/image libs, those
could be moved on/off device quicker. But it appears that N1 limits such external transfer rates, making it moot to go for faster cards (unless you use APP2SD) . One can get faster rates by yanking the card out and using an external, proper, reader - so that might help if one needs to move say 10GB of music onto the card.
Bottom line: you can spring for 16GB Class 6 Card (Adata's are good, about U$60 on Amazon), save few bux and get slower card or wait another month for 32GB cards to appear in stores and make your decision _then_
rashid11 said:
There are 2 distinct things about SD card performance:
1) If one roots and uses APP2SD method, where N1 stores apps on an EXT* partition on on the _card_ , instead of its own, built-in and very limited flash storage, then one would probably want faster performing card so that apps load faster. Especially if you have a game with tons of textures/scenery
2) Unrelated to #1, faster cards should allow faster transfer rates from one's computer to the N1's SD card - so when you have large music/image libs, those
could be moved on/off device quicker. But it appears that N1 limits such external transfer rates, making it moot to go for faster cards (unless you use APP2SD) . One can get faster rates by yanking the card out and using an external, proper, reader - so that might help if one needs to move say 10GB of music onto the card.
Bottom line: you can spring for 16GB Class 6 Card (Adata's are good, about U$60 on Amazon), save few bux and get slower card or wait another month for 32GB cards to appear in stores and make your decision _then_
Click to expand...
Click to collapse
I got lucky. I won my 16GB class 6 micro SD card. I do, however, wish to get another 16GB card but don't want to spend the money so I'm waiting for the 32GB to come out and the 16GB to drop in price. 8GB is just not enough for music, apps2sd and nadroid/ext backups. I've been having to compromise and either keep only one nandroid on my SD card or cut down on my music (which I hate doing). A 32GB card would be GOLDEN but I don't even want to think about what that's going to cost.
rashid11 said:
There are 2 distinct things about SD card performance:
1) If one roots and uses APP2SD method, where N1 stores apps on an EXT* partition on on the _card_ , instead of its own, built-in and very limited flash storage, then one would probably want faster performing card so that apps load faster. Especially if you have a game with tons of textures/scenery
2) Unrelated to #1, faster cards should allow faster transfer rates from one's computer to the N1's SD card - so when you have large music/image libs, those
could be moved on/off device quicker. But it appears that N1 limits such external transfer rates, making it moot to go for faster cards (unless you use APP2SD) . One can get faster rates by yanking the card out and using an external, proper, reader - so that might help if one needs to move say 10GB of music onto the card.
Bottom line: you can spring for 16GB Class 6 Card (Adata's are good, about U$60 on Amazon), save few bux and get slower card or wait another month for 32GB cards to appear in stores and make your decision _then_
Click to expand...
Click to collapse
Thanks for the explaination. Now do you think anybody out there is trying to 'open' up this limitation of the N1's transfer speed? Hope so...I thought I had an adapter...so I ordered a card without an adapter...but, now I can't find it!
BTW...I sprung for a 16GB class 6. Was a present...so why not.

Categories

Resources