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by guilhermino
Wed Mar 25, 2015 10:27 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

To align a card to the flash erase block size you merely have to first find the erase block size using a utility like "flashbench" mentioned here even by its author ( the info supplied with the utility is quite enough to compile and use, mind you though that it is a linux utility, I haven't found no...
by guilhermino
Thu Mar 19, 2015 3:38 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

by dax7 » Mon Mar 16, 2015 11:08 pm is the Samsung 16GB Pro card the best for a pi 2? Sorry for the late answer but I did not notice your post. To answer your question: yes, I think the pro version should be the best, and I believe the price is not very different, where the only downside may be in ...
by guilhermino
Mon Mar 16, 2015 11:07 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

Of course that if you align the partition to the flash erase block size you will get even better performance.
by guilhermino
Mon Mar 16, 2015 11:04 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

For those of you that use CristalDiskMark or any other software that works with FAT32 benchmarking I've found this utility that worked for me on a USB Pen, achieving top performance as factory formated:

https://www.sdcard.org/downloads/format ... index.html
by guilhermino
Wed Feb 11, 2015 3:57 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

As I was trying to say some cards have the area reserved for the FAT table optimized, as explained on one of the links I've posted, however the only way that I know to find out where it resides is using the flasbench linux utility, though I haven't been any fortunate at it, but in case you want to t...
by guilhermino
Mon Feb 09, 2015 11:34 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

I think FAT location matters as well since it is optimized in many SD cards, not sure how you change that though, also did you try with a 32K cluster because that seems to be the native write-unit of this particular card ? Not sure if you could also try the page size of 8K.
by guilhermino
Sun Jan 25, 2015 1:07 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

by guilhermino
Sun Jan 25, 2015 12:47 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

I think you should all be aware of this as well: http://www.raspberrypi.org/forums/viewt ... ?f=9&t=850

I just wouldn't bother with the disk geometry optimizations as I believe this is not used in modern systems as far as I know.
by guilhermino
Sun Jan 25, 2015 12:37 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

As far as I know yes.
by guilhermino
Sun Jan 25, 2015 12:33 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

Yes, it is. But beware that it was a Hong Kong supplier and I can't guarantee they will all be the same batch. I think it may very well be a question of luck.
by guilhermino
Sun Jan 25, 2015 12:17 am
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

My belief is that anything that uses a large database or any other process that reads and writes small chunks of data like, for example in data aquisition, will benefit from this, but I don't know for sure. In my case it certainly made a big difference. I bought this card on ebay. You can find the l...
by guilhermino
Sat Jan 24, 2015 11:14 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

Unfortunately I can only show the benchmark before these optimizations were made since CristalDiskMark is a windows only program and I do not seem to be able to read the ext4 partition on windows ( even using the Ext2Fsd freeware program ) even though I could see the result of the optimizations on t...
by guilhermino
Sat Jan 24, 2015 3:52 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

I think you should also all be aware of this: https://blogofterje.wordpress.com/2012/ ... on-sd-card
by guilhermino
Fri Jan 23, 2015 11:43 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

By the way the SD card reader on my laptop is not UHS-1
by guilhermino
Fri Jan 23, 2015 11:39 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

I've exagerated ( quite ) a bit on saying double the speed but here are the numbers and some more details: Full Size SD: ----------------------------------------------------------------------- CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo Crystal Dew World : http://crystalmark.info/ -------------...
by guilhermino
Wed Dec 31, 2014 11:17 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 293796

Re: SD Card Benchmarks

SAMSUNG EVO UHS-1 UC-1 CL10 16GB Micro SD MBMPAGVDDBCW-B MANFID: 0x1B OEMID: 0x534D Date: 09/2014 ----------------------------------------------------------------------- CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo Crystal Dew World : http://crystalmark.info/ ------------------------------------...

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