I got a PNY 16gb class 10 microsd card from Play.com last week for my SGS2.
I've read on these forums that higher speed rated cards have different charateristics, i.e. trade off access time for throughput. SD tools confirmed very fast throughput (13MB write/24MB read) however after putting the card in and putting about 2gigs of content on it, the phone started to behave very strangely.
The phone would get very hot with no obvious activity and remain very hot with the battery running down very quickly. Sometimes randomly, but always being triggered by SD Tools (which would hang and have to be killed with task manager).
I had been suffering random reboots (about twice a week) before then, so to rule out a faulty phone I had it replaced for new at car phone warehouse.
However, the exact same behaviour with hot phone, battery running down alarmingly quickly happened with the new one. Only way to resolve was to pull the battery.
I've since swapped back to an old 8gb class 6, which while a tad slower (9MB write/19MB read) doesnt cause the phone to behave badly.
Maybe it´s the app and not the SD card......................
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Just an off the wall question for everyone. What kind of micro SD card are you guys using? Anyone try a class 10 card versus a class 6 card and notice a different in the Vibrant??
Still using the standard..don't see a point until apps2sd is enabled...at that point ill probably just use the class 6 8gb from my mt3g
Sent from my Samsung Vibrant using XDA App
zenlakin said:
Just an off the wall question for everyone. What kind of micro SD card are you guys using? Anyone try a class 10 card versus a class 6 card and notice a different in the Vibrant??
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It's kinda complicated but here are a few things to note. First most people notice a decrease in speed when going from a 8gig class 6 to a 16gig class 6. This has to deal with the fact phones only regulate a certain amount of voltage to the microsd slot. In order to get more storage into the same amount of space more voltage is needed to keep it running at a class 6 rate of speed. The reason the phone doesn't adjust it's voltage is because it causes more heat (which can of course cause damage to the phone) and it waste more battery.
Second because of this voltage regulation you will never notice the difference between a class 6 and a class 10 card while inserted into the phone unless they figured out how to get class 10 speeds on lower voltage. So this means that you should never read stats presented by the manufacture and actually try to get people who own the card to do a speed test. If we can get every card benchmarked while inserted into a phone then we can have a better understanding of what card is actually faster.
This thread is to gather everyone's experience on the performance of the 16gb Samsung MicroSD card that is being sent out as a replacement to HD2 owners who called and complained about the original card that was shipped with the phone.
Many people have commented to have very different experiences. Some good. Most bad.
My personal experience is ever since I started using the replacement, the performance of android has dropped with random but frequent temperary BSOD. The wakup time time went from instant (original SD) to 10-15 second delay (new SD).
What are your experiences with the new replacement card?
For me, it has been mostly good. Earlier I was using 8GB Adata card (class 4), android ran fine on it but it had delay of 5-15 seconds if I woke up the phones 2 or more times quickly say within a minute.
With the replacement card (16gb samsung class 2) its instant...however if I wake the phone 3-4 times within a minute then there is lag..
Standy power drain is same on both 3-8mAh
I have a Kingston 16gb Class 4/6 (I forget) and it was working fin up til yesterday night. My phone was heating up, especially around the area of the SD card. And so I turned it off for a while, but then it was stilll heating up, so I took out the battery, and it hardreset. Now it says I only have a total 0f the default 7.4gb-8gb memory.
I've reformatted like... 5 times already, and nothing has been working interms of getting that memory back on.
This Focus is starting to get a lot more frustrating -__-
Please help!
Oh and even now, it's still heating up and all that.
I would definitely take that card out and reformat without it. Sounds scary. Not worth frying the phone.
Sent from my SGH-i917 using XDA Windows Phone 7 App
Yeahhh I did. I'm hoping if I can get the card back to normal( I've read that either through a camera or a Symbian phone can reformat thecard to its normal pre-wp7 state) I can pop it back in. But actually... It seems as though my phone is a lot better
Without the sd card. Battery life is back to normal and it just feels like a much better phone in general. So I'm partially happy, still don't have my 22gb total anymore though
Given that the read/write cycles on SD cards are finite, is there an estimated lifespan of a card running CM7?
The Mean Time Between Failures for most SDHC cards is a million hours or 20 thousand insertions.
Having said that, that's just the average of all manufacturers and Your Mileage May Vary
Edit: At the high rate of 15 insertions per day (about average for a CM7 flashoholic); it would take 3 or 4 years to die.
2nd Edit: If you are more interested in write cycles, you are looking at 100,000 or so. You can increase the life by buying good quality and using bigger capacities than you need (fewer erases). I'm not sure if micro SD incorporates load leveling, but that extends the life in full size SD cards.
Read/write cycles are what I am wondering about. I am very new to the android stuff and up until now all I used SD cards for was in cameras and data storage. I assume that running an OS like CM7 off a SD would require lots of read/writes to and from the NC, or I could be wrong on this.
...when you start seeing a lot of FC errors
votinh said:
...when you start seeing a lot of FC errors
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That and/or the reported size starts shrinking. It keeps a "bad sectors" map. Just pray that you don't get a random read error that generates a catastrophic command. You do have sudo rights after all
Honestly, that's the best argument for switching the ROM to emmc yet.
DiDGR8 said:
That and/or the reported size starts shrinking. It keeps a "bad sectors" map. Just pray that you don't get a random read error that generates a catastrophic command. You do have sudo rights after all
Honestly, that's the best argument for switching the ROM to emmc yet.
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The eMMC has similar limitations as the uSD card with regard to read/write cycles.
Off topic, but I've noticed slow write speeds on my SD lately. I bought it close to 2 years ago when 16 Gb class (10) cards were still fairly expensive. I never did see a minimum of 10 MB/s which should have prompted me to return it immediately. My card always registered around a class (6) status.
Anyway, as of late my Kingston card has slowed to a crawl. I decided to test it both in and out of my Evo and I'm getting an average of 1.4 MB/s. Even my old Sandisk 8Gb class (2) card scores a consistent 2 MB/s.
I've heard of flash memory eventually going bad, is this a sign of an eventual card failure? I also noticed in my testing, the write speeds are not sustained. The graph shows peaks and valleys which averages to 1.4 MB/s. My other cards are flat and consistent.