[General Accessories] icincan:
Samsung 32GB Class10 vs Sandisk 32Gb Ultra class 10

Hi guys! This is my first post here , on this forum, even I was reading you from years. First of all excuse my somehow poor english but I hope you will undersend what I'm saying. Your posts was very helpful to me those years and now, in making an ideea of memory cards and speeds. Unfortunately not all of the members are posting correct things. In fact I'm pretty sure that it is almost impossible for a 32 Gb Sandisk Ultra to achieve 40 MB/s in Read when the specs says that maximum is 30 MB/s in the best conditions. But despite these things and tests, in real "life" things stays somehow different. The real life simple test is to put those cards for example in the PC via USB and transfer files ( most of the time pictures and videos) from and to them. I begin these tests after I bought my first 32Gb Samsung Class 10 (I choose Samsung instead Sandisk 32 Gb ultra class 10 because of the price, 30% higer for Sandisk) and I wanted to test it.I saw that in real life, the speeds are slower then tests and far from specs. In fact, the specs for the 32 Gb Samsung class 10 are MAX 24 MB/s for reading and MAX 13MB/s for writing. The tests ( Crystal Disk Mark) measured an aprox 16MB/s and aprox 10 MB/s Writing, wich is pretty fare, comparing the specs. In the real life, if I wanted to transfer a folder with a bunch of Images and videos of different sizes, I saw that the speeds are about 12- 13 MB/s for reading and 7,2 for one card and 8,5 MB/s for the second (of course, in my case, I am talking about my two Samsung 32 Gb class 10 cards). We are talking about the half from specs and about 25-30% from tests, wich is somehow dissapointing, but as you ll see forward, these are prety good results and made me to buy for my second smartphone( both my phones are HTC Sensation), another 32 Gb Samsung class 10 despite the Sandisk 32 Gb Ultra . So, after I tested the first Samsung card, I was dissapointed and I decided to buy an 32 Gb Sandisk Ultra class 10 UHS 1, even it costs 30% higher. Surprise!!! In a 50 MB scores similar or little better than Samsung, about 16 MB/s reading and about 10-11MB/s writing. But the bigest surprise is yet to come! In an 1000 MB CrystalDiskMark test, the speed for Sun for 512K writing test is only about 2MB/s ( yes,you read it right only 2MB/s) for the Sandisk comparing to almost 10 in the case of Samsung card). So I begin the real life test with the same folder of 1.29 Gb I tested before. The reading is about 13-14 MB/s and writing is about 4,26( I.m talking about a 1.29 Gb folder with mixed JPEG, 3GPP and MP4. When I tried to transfer an amount of 8 Gb Jpeg and videos, the speed slows down constantly until 2,45MB/s. The Samsung card slows down to a little but never below 8.5MB/s even in the case of 8Gb folder. The time for transfering (writing) 1.29 Gb was 155 seconds for the Samsung and in case of the Sandisk was 310 seconds. Double time for a 1,29 Gb and God knows how much for 8 Gb or more !!! Incredible!!! I tried to understand what is hapening and gave me the ideea to try to write a single big file (mp4) of 1,5 Gb. Both cards achieved about 12 MB/s writing speeds. Then I tried to write an 1,5 Gb folder full of a Bunch of only JPEGs. Samsung slowed down and fixed at aprox 8.5 MB/s and Sandisk slowed down constantly until fixed at about 2,2-2,3 MB/s. So when it comes to big files ( videos, films), both cards scored similar and decent writing speeds but when you want to transfer (write) pictures wich are small filesfiles, Samsung scores far far better than Sandisk. Finally I returned the Sandisk card and I buyed another 32 Gb Samsung cls 10 for my second phone. Unfortunately,for me, the Sandisk mith it is not anymore a mith. Anyway, that was my personal experience and I don't know if was a isolated case or not. But from another posts here I saw scores in 512k writing for Sandisk 32Gb Ultra similar to my scores with My exSandisk card. So,my case was not isolated. I write that post because of the drastic different speed ( about 50%) between them and because I wished to read a similar post before I buy the Sandisk card, instead of baloons like 40MB/s speeds. I hope my post will help you even just as another real experience.