Slow SD interface? - JAM, MDA Compact, S100 General

I have a Sandisk Wifi + 256 mb card in my MDA Compact and eventhough the driver and such work flawlessly, the wifi performance is very disappointing. With an internet download benchmark I got about 26KB/s througput. I knew the card wasn't going to be fast before I bought it, but I was expecting to get at least something like 100KB/s.
At first I thought the problem was with the card itself, but when I tested an Sandisk Ultra II 256MB SD Memory card with pocket mechanic I noticed that the throughput to the memory card was also very low (0.26MB/s).
The throughput to the supplied mini SD was even worse (0.10MB/s).
Now I am wondering, is there a general problem with the SD bus interface? Can someone verify these results for me?
Or am I mistaken and should I not expect anything more? I did a full SPB benchmark on the device itself and the numbers were even a little better than to some posted in a review.
TIA!

yeah the jam seems to be slow with cards for some reason?!?!
i got a simpletech 10mb read/write one of the fastest and best cards out and i used to get over 1mb read/write on the xda2 with it but on the jam it gets 0.26mb write and 0.78mb read
with my ultra 60x 1gb it only gets 0.23 read and 0.63 write :\
seems so slow

I get similar speeds to this on my XDA II but the SD Card is much faster in an external USB 2.0 reader/writer.
Even worse, I bought a standard speed SanDisk 512k SD card that is so slow, the XDA II can not write to it at all!
I now only buy Ultra 60x or faster SD cards even though you don't get anything like that in performance in the O2 device itself - just reliablilty.
I use an external SD card reader/writer to load it with MP3s etc. I suffer 20 minute backups with Sprite Backup to SD card daily as I have no choice. (I also back up to 2 PCs as well daily - not much faster).
gazzaman2k said:
on the jam it gets 0.26mb write and 0.78mb read
with my ultra 60x 1gb it only gets 0.23 read and 0.63 write :\
seems so slow
Click to expand...
Click to collapse

Related

best 512 SD card

I have seen various makes / models on the market and I am thinking about a
SanDisk Ultra II 512 card
Does anyone have any experiance of this model
Ashby
512 SD card
what about a 1gb card has anyone got any suggestions on which one to get the o2 data support said that there are 1gb sd cards out there but all they've tested is up to 512 mb. They are firmly against the MMC cards but they couldn't explain why. The MMC card is cheaper.
Re: 512 SD card
jkn said:
what about a 1gb card has anyone got any suggestions on which one to get the o2 data support said that there are 1gb sd cards out there but all they've tested is up to 512 mb. They are firmly against the MMC cards but they couldn't explain why. The MMC card is cheaper.
Click to expand...
Click to collapse
The 1-GB SD cards only became available for purchase a little over a week ago.
The MMC is cheaper because it has a lower maximum transfer rate. But I have found many stores where the price of MMC and SD cards are the same.
Ultra II sd cards as far as i know only run at ultra speed if your sd-slot support it
ok guys any idea
how much a 1gb sd disk will cost, compatability and where from
cheers john
jkn said:
ok guys any idea
how much a 1gb sd disk will cost, compatability and where from
cheers john
Click to expand...
Click to collapse
As far as I know, the only 1-GB SD card brand available now is SanDisk. The price is around US$395. Other brands will soon follow.
with the price of 1GB compared to 512 and 256 then i'd rather have more cards and switch between them like
1 for goat and sheep p0rn collection
1 for mp3 music
1 gps maps (if i had a gps device)
1 for programs
......
Rudegar said:
with the price of 1GB compared to 512 and 256 then i'd rather have more cards and switch between them like
1 for goat and sheep p0rn collection
1 for mp3 music
1 gps maps (if i had a gps device)
1 for programs
......
Click to expand...
Click to collapse
totally agree
as only one has just come out it's likely to be quite expensive
but if people keep a look out they can let us know when other models come out and where to get the best prices
failing that they could swap their donkey porn collection that takes up less memory !
I use a Kingston 512mB SD, works well in the XDA II, no speed problems or loss of data. I use it mainly for camera images and large data files but also for my regular backup (Sprite Backup Premium) and several applications which I don't use often.
Ed
I have a 512mb ultra ii on order, for quicker access to gps maps and voice etc, and should receive it next week. I'll try to post back here when I've tried it, assuming that there is any discernable difference.
frankly speaking I use regular sandisk 512MB SD card only due to high price for everything with Kingston sticker on it, IMHO kingston has not been manufacturing memory cards for years but branding other manufacturers products, including memory ...
one thing that is of interest to me is .... whether these sandisk ultra II SD cards are really faster and to waht extent, especially considering the fact what is the SD card port in XDA / XDA II, i.e. what is the internal port speed limit as compared with new and speedy cards ??
regards, monika
PinkySlayer said:
I have a 512mb ultra ii on order, for quicker access to gps maps and voice etc, and should receive it next week. I'll try to post back here when I've tried it, assuming that there is any discernable difference.
Click to expand...
Click to collapse
I've just received the ultra ii and although I haven't USED it yet, here are some benchmarks...
Internal Integral SanDisk Ultra II
Read MB/s 1.55 0.13 0.20
Write MB/s 0.10 0.02 0.68
Min Read ms 0.25 0.25 0.25
Max Read ms 1.50 9.75 8.5
Ave Read ms 0.32 4.14 2.43
Total Read ms 813 10368 6089
Min Write ms 0.25 0.75 0.28
Max Write ms 165 108 6.75
Ave Write ms 4.87 28.85 0.72
Total Write ms 12310 72246 1810
I've only done a quick test abd should really have repeated them several times and taken averages. However, this clearly shows that the Ultra is built to WRITE FAST, even blowing away my XDA II's internal storage.
sandisk 256MB
I just bought my second sandisk 256MB works fine for me, i bought it for my new NAVMAN 4410
I use a Kingston 512Mb
Works great, using it mostly for watching divx but I also have some music and GPS maps on it. In Sweden Kingston is much cheaper then Sandisk.
The only strange thing is that Im only able to use 488Mb...
The card was preformated so maybe thats a reason...
Steves digicams did a big test some time ago on compactflash memorys and the ultra memorys wasnt always faster. I would save the money and buy regular, its fast enough for the programs in the XDAII.
/miki
seem to recall that all sd cards give you less then they are labeld because of the secure encryption features which make SD cards different from mmc cards apart from being a bit thicker
has,nt anybody got any price,s?
I paid £129 through eBay.
Sandisk 512 Mb for € 159,-
www.geheugenkaart.be
So around £129 for an Ultra II or around £107 for a 'normal' one - I know which one I'd rather have!
thanks i think its time i get my wallet out.hehe

SD Ultra card

Can we use the Sandisk 'Ultra' line? If yes, does anybody know if the faster transfer rate of the Ultra card is supported by the XDA?
try using pocketmecanics it got a benchmark tool
and that seem to show that
the xda2 at least use the pretty slow intel xcale internal sd interface
making the xda1 faster when it comes to sd speed
with mechanics you can compare your result with a list of pda's with different sd cards
non of them ever reach ultra speeds
heck they dont even reach the max speed of normal sd cards
if you compare the speed with the same card in a SD card reader
but that dont mean there is not difference in speed
like Sandisk is the slowest thing ever
I'm using a Panasonic 512MB SD Card and it's supposedly faster (and better) than the SanDisk Ultra.
YMMV

Speed of SD slot

Hi, does anyone know what the max supported speed is? I can buy a 2 mb/s write and 3 mb/s read 1 GB SD card or a 5mb/s write and 6 mb/s read for just 10€ more.
So my question is, should I pay 10€ more?
Buy the fastest
Because ifyou by a usb card reader you will be able to copy data faster.
So it only matters if I also buy a cardreader?
Hmm i wondering about this myself even, whats the different . Can anyone answer exact how fast the qtek s100 writes and read. It must be some meaning of faster memeory card. Example Simpletech has 10/10mb fast and writing speed . And Sandisk 1.5/5mb i think. Dont the phone be faster with faster memory card???? please someone?
the card reader is really slow
i've bought a Sandisk 1GB Extreme III SD card, but in fact it is slower that a normal 512MB Kingston SD card, to bad... (both around the 1MB/s with PocketMechanic SD benchmarking).

512MB SD: Panasonic Highspeed vs Sandisk UltraII...

Hi guys!
I've got 2 512M SD memory card:
- Sandisk UltraII 512MB
- Panasonic High speed 512MB
...and I've got 2 device:
- i-mate Jam (QTEK S100)
- Canon PowerShot SD300 camera
Waht's the difference between the 2 SD?
In your opinion the speed are identical?
Is it better to put the Sandisk into Jam or into the camera?
Hi
I read a long discussion about SD card speeds on this site ages ago.. as i understand it, PPC can only read and write at a FRACTION of a slow/normal SD cards read/write speed, so it really makes no difference.. might as well put the biggest, cheapest card you can in it as anything alse is a waste of a memory card...
My own limited experince with a few sd cards i have (bog standard up to sandisk xtreeme III) shows no difference in speed across the cards.
Lovely caemra you have by the way
Gero
Hi
I read a long discussion about SD card speeds on this site ages ago.. as i understand it, PPC can only read and write at a FRACTION of a slow/normal SD cards read/write speed, so it really makes no difference.. might as well put the biggest, cheapest card you can in it as anything alse is a waste of a memory card...
My own limited experince with a few sd cards i have (bog standard up to sandisk xtreeme III) shows no difference in speed across the cards.
Lovely caemra you have by the way
Gero
Thanks!!
Well... I understand that in ppc I can put the slower one but...
Sandisk Ultra II vs Pnasonic highspeed?
What is the faster? (I'll put the faster in my camera!)

miniSD speed

Hi,
does the Wizard have a maximum transfer speed for access to the miniSD card slot?
I'm looking for a miniSD card, and thinking of whether the Wizard can take advantage of the very high speeds of the latest cards. Is it worth giving the extra money to get a very fast card or not?
Is 150x about the fastest available?
AFAIK 80x is the fastest available miniSD
Im using it (1GB 80x)
Maybe we can do some benchmarks? any good software to test memory?
ATP claims 150x speed
georgex said:
Hi,
does the Wizard have a maximum transfer speed for access to the miniSD card slot?
I'm looking for a miniSD card, and thinking of whether the Wizard can take advantage of the very high speeds of the latest cards. Is it worth giving the extra money to get a very fast card or not?
Is 150x about the fastest available?
Click to expand...
Click to collapse
Don't bother spending extra money for a high speed card. Even going back to the earliest days of PPC's, it's all about the PPC's I/O to the media card. The only real advantages of a high speed card is when using with a digital camera or when using the card in a card reader.
I have a Sandisk 1gb card that runs just fine in my K-JAM. On my 2750, I have a 1GB Lexar sd and 1gb Lexar CF.
JNGold said:
Don't bother spending extra money for a high speed card. Even going back to the earliest days of PPC's, it's all about the PPC's I/O to the media card. The only real advantages of a high speed card is when using with a digital camera or when using the card in a card reader.
Click to expand...
Click to collapse
Thanks! That's an answer for one of my questions. Could you please try to help me a little bit more?
Sorry to ask that way...
Regards
georgex said:
Hi,
does the Wizard have a maximum transfer speed for access to the miniSD card slot?
I'm looking for a miniSD card, and thinking of whether the Wizard can take advantage of the very high speeds of the latest cards. Is it worth giving the extra money to get a very fast card or not?
Is 150x about the fastest available?
Click to expand...
Click to collapse
You won't be able to use the full potential of fast cards. Please read http://pocketpcmag.com/forum/topic.asp?TOPIC_ID=17921 for my article on all this stuff.
I'm glad I found this thread. I've installed some software onto the miniSD card and I noticed they load slower. The worsest problem is now the soft keyboard selection menu takes a full 7 seconds to pull up. I was thinking about buying a faster miniSD to solve this problem, looks like I'll just have to live with it.

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