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舊 08-10-10, 05:30 PM   #240
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註冊日期: Feb 2004
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http://forums.whirlpool.net.au/forum...m/1468705.html
microSD card speeds in-phone

We've just been discussing this in the Nexus thread. There is an in-phone benchmark you can do called J BENCHMARK TEST FOR DEVELOPER

I will maintain this list if you post your results (include your phone type and ROM)
In the test set it to 10MB data and 8k buffer.

The general consensus seems to be to run it about 5 times and post your test result with the best write speed.

Sorted by best write speed....

HTC Nexus One:

Sandisk 16GB Class 2: 6.94MB/s Write, 8.74MB/s Read, Stock 2.1
Sandisk 32GB Class 2: 6.86MB/s Write, 10.65MB/s Read, CM 5.0.7.1
Transcend 16GB Class 6: 6.69MB/s Write, 9.03MB/s Read, CM 5.0.7.1
Sandisk 8GB Class 6: 5.91MB/s Write, 8.20MB/s Read, FroYo FRF91
Transcend 8gb Class 6: 5.49MB/s Write, 9.14MB/s, Read, FroYo FRF91
Sandisk 16GB Class 2: 5.38MB/s Write, 8.10MB/s Read, FroYo FRF83
Apacer 16GB Class 4: 5.19MB/s Write, 10.66MB/s Read, CM-5.0.8-test5
Toshiba 16GB Class 2: 5.17MB/s Write, 7.86MB/s Read, Froyo (Modoco)
Sandisk 16GB Class 2: 5.15MB/s Write, 8.68MB/s Read, FroYo FRF50
Sandisk 8GB Class 4: 4.69MB/s Write, 9.78MB/s Read, FroYo FRF50


HTC Desire:

Sandisk 8GB Class 2: 8.45MB/s Write, 11.14MB/s Read, Telstra 2.1
TeamMicro 16gb Class 6: 8.31MB/s Write, 13.95MB/s Read, Telstra 2.1
Kingston 16GB Class 2: 8.02MB/s Write, 9.99MB/s Read, Telstra 2.1
Toshiba 16GB Class 2: 7.79MB/s Write, 11.51MB/s Read, Telstra 2.1
Lexar 16GB Class 6: 7.48MB/s Write, 12.72MB/s Read, HTC 2.1
Toshiba 16GB Class 4: 7.03MB/s Write, 11.27MB/s Read, Telstra 2.1
Sandisk 32GB Class 2: 6.83MB/s Write, 11.89MB/s Read, Telstra 2.1
Sandisk 32GB Class 2: 6.71MB/s Write, 11.07MB/s Read, HTC 2.1
Sandisk 16GB Class 2: 6.18MB/s Write, 12.00MB/s Read, HTC 2.1


HTC Legend:

Sandisk 16GB Class 2: 4.60MB/s Write, 11.00MB/s Read, HTC 2.1


Motorola Milestone :

Sandisk 8GB Class 2: 9.15MB/s Write, 10.64MB/s Read, @1GHz Stock 2.1
Sandisk 8GB Class 2: 6.09MB/s Write, 6.94MB/s Read, @0.55GHz Stock 2.1Kingston 16GB Class 2: 4.51MB/s Write, 8.58MB/s Read, @0.55GHz Stock 2.1


Samsung Galaxy S:

Internal Flash 8/16GB: 13.85MB/s Write, 18.87MB/s Read, Stock 2.1
Internal Flash 8/16GB: 1.13MB/s Write, 11.22MB/s Read, Stock 2.1
Sandisk 32GB Class 2: 10.73MB/s Write, 18.80MB/s Read, Stock 2.1


Some notes:

SD Class ratings are quite a limited indication of speed (The Class number is the minimum MB/s write speed, eg. Class 2 is 2MB/s). In my experience all recent big brand (>=8GB) Class 2 cards give at least 6MB/s write speed, which means they could just as well be called Class 6. So my speculation is that since Class 6 was the highest official rating available for quite a while (Class 10 was only added very recently), this caused manufacturers to only use the higher class ratings on their genuinely faster cards and to charge accordingly, (otherwise they would have all been Class 6). So C2=standard, C4=faster, C6=even yet still faster, C10=fastest.

These speeds are in-phone speeds, they do not reflect the speeds when connected to a PC via a USB reader or whatever. For example, my in-phone speed of my Sandisk 8GB Class 4 is 4.69MB/s Write, 9.78MB/s Read, but in my microMate USB reader in my PC it is 14.22MB/s write and 15.99MB/s read, a big difference. Tests on the PC can be done using CrystalDiskMark but don't use your phone as a USB reader or you may be in for a nasty shock (eg. 2MB/s with FroYo RC!!!).
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