Help Micro SDHC card discussion for the Evo 3D.

Me thinks a few of you guys have your number backwards--read speed should be higher than write speed.

I have the 32GB PNY Class 10 card listed above from Newegg. It's amazing. I actually notice a speed increase in the overall UI of the phone. Not exactly sure what OS data is stored on the card, but the speed increase of general, day to day tasks, has increased.

Emblazon said:

Me thinks a few of you guys have your number backwards--read speed should be higher than write speed.

I have the 32GB PNY Class 10 card listed above from Newegg. It's amazing. I actually notice a speed increase in the overall UI of the phone. Not exactly sure what OS data is stored on the card, but the speed increase of general, day to day tasks, has increased.

Click to expand...

Care to share your R/W w/ SD Tools from Market?

Total space: 29.81GB
Available: 26.21GB

1. 8.3 Write, 17.0 Read
2. 8.5 Write, 19.2 Read
3. 8.5 Write, 18.0 Read

MB/s.

I finally got my Lexar 32GB Class 10!

I formatted it with my PC then copied all of my files over that were on the original SD card. Everything seems to be working fine.

My highest speeds using SD Tool are:

Write: 8.8 MB/s

Read: 19.3 MB/s

I'm pretty happy with that

So, does this mean that the sdcard read ahead limit that was on the EVO 4G does not cripple the sdcard in the EVO 3D? Sorry, I haven't been following.

atg284 said:

I finally got my Lexar 32GB Class 10!

I formatted it with my PC then copied all of my files over that were on the original SD card. Everything seems to be working fine.

My highest speeds using SD Tool are:

Write: 8.8 MB/s

Read: 19.3 MB/s

I'm pretty happy with that

Click to expand...

I may have the same Lexar 32mb class10 card in my EVO 4G and it performs at very similar numbers. However, I had a Transcend 8gb Class 6 card before that and always got write speeds above 10 mb/s. I have yet to test in my 3D, though.

I have a similar card setup (32GB Class 10), but with at least 16 3D movies on it. Now I'm down to 17GB of total free space. My device is fully fortified to entertain me with movies and games for well over 24 hours straight, easily... But then between the 4000mah battery, and 32GB micro card, that was all a part of my plan from the beginning anyway.

And if a 64GB micro SD card became available tomorrow, I'd get that too.

Has anyone charted or benchmarked Class 6, 4 or whatever so I can see the value between them?

I was all set to buy a 32GB Class 10 card for my EVO 3D, but I started doing some research and ran across this interesting thread:

http://forums.whirlpool.net.au/forum-replies.cfm?t=1582172

I hope it's okay to post that. They've collected some very interesting data.

It seems that although the class 10 cards are much faster while reading/writing large amounts of data, they are terribly slow when reading/writing small amounts. The fastest class 2 card tested is more than 357 times as fast as the fastest class 10 card when writing 4KB of data.

It is stated that:

The above table is for random R/W results. This is an important measure for users of ROMs that allow for certain OS functions to be run off the SD card (apparently the 4k write speed is most important).

Click to expand...

So I'm left wondering what to do. Obviously I want my phone to be fast for small functions. Otoh, I would also like to get the most out of the video of my phone. Since the EVO 3D is recording 2 simultaneous videos when in 3D mode, I would imagine the top write speed is more important than other phones.

I would love to hear from anybody that has experimented with different cards on the 3VO.

Is there any reason for me to consider SD card partition?

How about Link2SD?

Hi there,

I'd like to know if HTC EVO 3D is compatible with SanDisk 32 GB Extreme SDHC card. I saw this card on amazon for 80$. Is it a good offer ?

Thx in advance

Best regards,
Michael.

Is it a micro SD card?

-If yes, then yes.
-If no, then no.

The only thing I'd worry about is the "Extreme," as I have no idea what that does or is. If anything it'll work but won't be all that extreme.

Sandisk markets various grades of SD and CF cards with different names attached to them (like the "extreme" on your card). The different superlatives mean that the card is faster, and in the case of some very high end cards, more resistant to abuse and adverse conditions.

The main difference for "Extreme" is that the card is claimed to be faster (and Sandisk is quite reputable, so the card probably really is faster if it is a genuine Sandisk card).

Faster SD cards are discussed in other places here, main differences I'd expect you to see are scanning the card more quickly for new media you've installed on the card, and some people claim better performance for recording HD video. I can confirm that faster cards are quicker at locating all the videos I've loaded on them (I'm bad about pulling out my phone and watching a short video for a few minutes when I have a break). I don't do video recording on my phone, so I have no idea if the claims about HD video are true.

There are a _LOT_ of complaints about counterfeit SD cards out there, especially Sandisk ones, so I'd be careful who I bought from. If the offer is from Amazon itself, you should be fine. If it is one of their third party vendors, I'd do a bit of checking on the vendor.

JunBringer said:

The only thing I'd worry about is the "Extreme," as I have no idea what that does or is. If anything it'll work but won't be all that extreme.

Click to expand...

It means that this is Speed Class no. 10.

Damn it, I've just read this post (I can't post links here yet, so I have to quote it):

aliveon2legs said:

I was all set to buy a 32GB Class 10 card for my EVO 3D, but I started doing some research and ran across this interesting thread:

[I can't post links]

I hope it's okay to post that. They've collected some very interesting data.

It seems that although the class 10 cards are much faster while reading/writing large amounts of data, they are terribly slow when reading/writing small amounts. The fastest class 2 card tested is more than 357 times as fast as the fastest class 10 card when writing 4KB of data.

It is stated that:
So I'm left wondering what to do. Obviously I want my phone to be fast for small functions. Otoh, I would also like to get the most out of the video of my phone. Since the EVO 3D is recording 2 simultaneous videos when in 3D mode, I would imagine the top write speed is more important than other phones.

I would love to hear from anybody that has experimented with different cards on the 3VO.

Click to expand...

and now I don't know if this Extreme card's gonna be fast Probably, I'll have to reconsider buying a card with Speed Class 2 or 4...

What would you guys do, if you're on my place ?

Hmm, it's SDHC card, not microSDHC - my bad.

Looks like I'll have to buy a microSDHC card with Speed Class no. 4. I haven't seen any microSDHC cards with Speed Class above 4 so... I guess my problem's solved

Hey guys,

I've got my 3vo for the past 2 weeks. Next week when I get my "government money check" (Squidbillies for all you Adult Swim fans) I intend on getting a 32gb class 10 card. Anyone know of a good one for under 75 bucks with at least a 4 star rating? I've been browsing this thread and everyone seems to be thinking class 10 is unnecessary but I want my phone to be a robogod. I've got 12 gigs of mp3's going on it right away so 16 is out of the question IMHO but feel free to correct me if I can swing 4gb of space after loading the mp3s and still enjoy speed.

Thanks,

Mike

Topram 32gb class 10! I had a 16 class 6 and now a 32 class 10 and it is great

DonB said:

Here is what Wake is talking about and the price looks decent, click HERE or HERE

Click to expand...

I got mine for cheaper, 71.23 after shipping

Sandisk 8gb Class 4 (Stock Evo 3d sdcard)

Sequential Read : 20.111 MB/s
Sequential Write : 5.921 MB/s
Random Read 512KB : 19.834 MB/s
Random Write 512KB : 1.922 MB/s
Random Read 4KB (QD=1) : 4.193 MB/s [ 1023.8 IOPS]
Random Write 4KB (QD=1) : 0.623 MB/s [ 152.1 IOPS]
Random Read 4KB (QD=32) : 4.083 MB/s [ 996.8 IOPS]
Random Write 4KB (QD=32) : 0.645 MB/s [ 157.5 IOPS]


Adata 16gb Class 10

Sequential Read : 20.308 MB/s
Sequential Write : 17.702 MB/s
Random Read 512KB : 20.014 MB/s
Random Write 512KB : 3.264 MB/s
Random Read 4KB (QD=1) : 4.155 MB/s [ 1014.3 IOPS]
Random Write 4KB (QD=1) : 0.025 MB/s [ 6.1 IOPS]
Random Read 4KB (QD=32) : 4.533 MB/s [ 1106.7 IOPS]
Random Write 4KB (QD=32) : 0.022 MB/s [ 5.5 IOPS]


Transcend 8gb Class 6

Sequential Read : 20.111 MB/s
Sequential Write : 19.093 MB/s
Random Read 512KB : 19.269 MB/s
Random Write 512KB : 1.278 MB/s
Random Read 4KB (QD=1) : 3.737 MB/s [ 912.3 IOPS]
Random Write 4KB (QD=1) : 0.014 MB/s [ 3.5 IOPS]
Random Read 4KB (QD=32) : 3.863 MB/s [ 943.0 IOPS]
Random Write 4KB (QD=32) : 0.030 MB/s [ 7.4 IOPS]

Lexar 32gb Class 10

Sequential Read : 20.065 MB/s
Sequential Write : 11.832 MB/s
Random Read 512KB : 19.922 MB/s
Random Write 512KB : 1.436 MB/s
Random Read 4KB (QD=1) : 5.161 MB/s [ 1260.0 IOPS]
Random Write 4KB (QD=1) : 0.013 MB/s [ 3.1 IOPS]
Random Read 4KB (QD=32) : 5.298 MB/s [ 1293.5 IOPS]
Random Write 4KB (QD=32) : 0.027 MB/s [ 6.5 IOPS]

Notice how the stock card destroys the higher class cards in 4K. I'm surprised that the Class 6 writes faster than the Class 10 for sequential. The lexar does the best for 4k read performance, though.

Is there any special way of formatting the cards to get better read/write performance with 4K?

No, Android will only accept FAT32 and the Linux partitioning method (I forget what it's called). If you only use a linux operating system, then I believe you can switch to the linux partition and it should work, and that may give you a bit of speed. But your phone will not be able to work as a disk drive with windows and mac based computers. FAT32 is universal to everything, which is why it was chosen for Android (At least, that's why I think they chose that). But it's ancient.

And what do you think about this series:


SanDisk

I have about 6 gigs left on my 32 gig card. Most of it is taken up by the movies I have on it. Although I don't mind having such limited space left, since the movies come in handy when I'm not sure what I want to watch to pass the time away when sitting around waiting for the wife to finish shopping, or at some boring social event.

I'm hoping a 64gig card will eventually become available for out devices at some point. If not, I'll just remove some of the older movies I don't watch as much... Like all the YT3D videos I've downloaded.

maypex067 said:

And what do you think about this series:


SanDisk® Mobile Ultra? microSDHC? Memory Card


? Does it pay to buy this Mobile Ultra card instead of plain microSDHC ?

Click to expand...

That looks like just a class 6 card. Sandisk has heat issues, i had 2 go bad in 6mos from the heat of my evo 4g so it's up to you