Categories
Devices Flash

Sandisk Cruzer USB 2.0 vs SanDisk Extreme USB 3.0

To get understanding of why cheap USB Flash are cheap and some expensive are expensive. Let’s compare two 32GB flash drives from SanDisk. Cheap one is SanDisk Cruzer 32GB SDCZ36-032G. Expensive one is SanDisk Extreme USB 3.0 SDCZ80-032G.

Sequential Read (MB/s) 16,452 91,141
Sequential Write (MB/s) 3,828 76,589
Random Read 512KB (MB/s) 16,371 83,097
Random Write 512KB (MB/s) 0,548 6,252
Random Read 4KB (QD=1) (MB/s) 2,788 10,368
Random Write 4KB (QD=1) (MB/s) 1,795 9,994
Random Read 4KB (QD=32) (MB/s) 2,693 9,12
Random Write 4KB (QD=32) (MB/s) 0,22 2,936
Price (approx.) 20$ 40$

 

Speed test done with CrystalDiskMark 3.0.1

Categories
Devices SD

Another SD Cards speed test (Transcend, Sandisk)

Yet another SD cards to test:
Sandisk MicroSD 16GB Ultra
Trnscend SD 32GB Class 10

Sandisk-MicroSD-16GB-UHS1-U30
Sequential Read (MB/s) 20,628 20,216 20,483 17,485 20,161 20.339
Sequential Write (MB/s) 18,589 12,979 20,064 11,23 16,82 8.532
Random Read 512KB (MB/s) 19,633 19,618 20,104 17,781 19,707 19,726
Random Write 512KB (MB/s) 4,911 1,465 1,56 1,858 0,681 6.851
Random Read 4KB (QD=1) (MB/s) 3,223 3,323 3,713 5,01 3,627 3,433
Random Write 4KB (QD=1) (MB/s) 0,046 0,012 1,382 0,017 0,006 1.692
Random Read 4KB (QD=32) (MB/s) 3,937 3,562 3,449 4,976 3,674 3.394
Random Write 4KB (QD=32) (MB/s) 0,049 0,013 0,448 0,018 0,006 0.449

* usual notebook embeded SDHC cardreader was used (without Sandisk proprietary 30MB/s or standard UHS-1 mode support)

tested with CrystalMark 3.0.1

Categories
Android

Passmark performance test

Passmark performance test yet another mobile performance benchmark. It show not only CPU or GPU speed, but also Memory speed and “HDD” speed.

Results for iOS devices:

http://www.iphonebenchmark.net

Result for Android:

http://www.androidbenchmark.net

Categories
Devices SD

SanDisk ImageMate SDDR-289 (UHS-1 USB 3.0)

Reading some old posts:

SanDisk Extreme 30 MB/s SD Card
SanDisk SDDR-199
SD Cards test with SDDR-1999

Now I know what was wrong with 30MB/s SanDisk Extreme SD cards. 30 MB/s was not standard bus speed for SD. So it is seems like only (one?) card reader from SanDisk was supporting that speed. And it was not a good idea to buy 30MB/s cards. Actually theoretical maximum speed for normal and high speed SD cards was 12.5 MB/s and 25MB/s (read as 10MB/s and 20 MB/s in real life). And, by the way, USB 2.0 (480 Mbit/s) has reallife speed for cardreader/hdd/etc ~ 30 MB/s at maximum.

New SD card standards are UHS-1 with 50 MB/s and 100 MB/s (read as 45 MB/s and 90 MB/s) and UHS-II with 156 MB/s and 312 MB/s.

So now some examples of UHS-1 standard in use:

SanDisk ImageMate SDDR-289 (USB 3.0)

SanDisk 16 GB UHS-1 45MB/s

USB 2.0 is not enough to get 45+ MB/s that is why UHS-* cardreaders must be USB 3.0 or other modern high speed interface.

Card formated to exFAT. Cardreaders setting “optimized for performance” in Windows 7.

USB Reader Card Read MB/s Write MB/s
USB 3.0 UHS-1 UHS-1 45MB/s 39MB/s 24MB/s
USB 2.0 UHS-1 UHS-1 45MB/s 26MB/s 16MB/s
USB 2.0 non UHS-1 UHS-1 45MB/s 18MB/s 14MB/s

Card Formatted to FAT32 by SD Formatter 3.1

USB Reader Card Read MB/s Write MB/s
USB 3.0 UHS-1 UHS-1 45MB/s 36MB/s 32MB/s
USB 2.0 UHS-1 UHS-1 45MB/s 25MB/s 20MB/s
USB 2.0 non UHS-1 UHS-1 45MB/s 18MB/s 17MB/s

speed tested with Flash Memory Toolkit “File Transfer (5MB)”

Categories
app apple iphone

Fieldrunners 2

One of the best tower defence game ever. Fieldrunners 2. For iPhone.

Subatomic Studios

Categories
app apple ipad

Google Chrome vs Apple Safari for iOS (quick speed test, iPad3)

Java sunspider test results:

Chrome java about 4 times slower.

Safari
Chrome

Scrolling seamless using Safari. Not seamless using Chrome.

Categories
apple Devices router wifi

Airport Extreme 2.4 GHz and 5GHz quick test

Airport Extreme + Mac Book Air 802.11n (5 GHz)
5 GHz
Airport Extreme + Mac Book Air 802.11n (2.4 GHz)
2.4 GHz

Categories
apple Devices ipad wifi

Wi-Fi certificate of The New iPad

Wi-Fi certificate of IPad 3 is exactly the same as for iPad 2

iPad 802.11n draft 2 2.4 GHz (antenna 1:1) Certificate
iPad 2 802.11n 2.4 GHz, 5 GHz (antenna 1:1/1:1) Certificate
iPad 3 802.11n 2.4 GHz, 5 GHz (antenna 1:1/1:1) Certificate

Some other devices:

Mac mini 2011 802.11n 2.4 GHz, 5 GHz (antenna 3:3/3:3) Certificate
Mac Book Air 2011 13″ 802.11n 2.4 GHz, 5 GHz (antenna 2:2/2:2) Certificate

Lenovo X201s (Intel WiFi Link 1000 BGN) 802.11n 2.4 GHz (antenna 2:1) Certificate

iPhone 4S 802.11n 2.4 GHz (antenna 1:1) Certificate

other devices http://certifications.wi-fi.org/search_products.php

Categories
apple Devices ipad

Size of The new iPad

20120325-212259.jpg

iPad 3 and iPad 2

Categories
apple Devices ipad iphone

The new iPad photo quality

iPad 2, iPad 3, iPhone 4S

20120325-205244.jpg