What is the max write speed of class 4?
1975056
Hello John, Unlike card write speeds that measure maximum performance, class ratings measure the minimum sustained speed required for recording an even rate of video onto the card. The class rating number corresponds to the transfer rate measured in megabytes per second. Class 2 cards are designed for a minimum sustained transfer rate of 2 megabytes per second, while Class 10 cards are designed for a minimum sustained transfer rate of 10MB.
407205
To add to what Neeraj Prabhu said.Class 10 labeling dose not apply to USB flash drives. Class 10 SD cards speeds 10MB/s. With my PNY Turbo I have seen write speeds above 100 MB/s. It's more than 10x as fast.
564218
class refers to the minimum transfer speed, and as far as i could tell from the sandisk web site, their 32gb microsd cards are class 2, regardless of what the picture looks like on amazon. in theory, when transferring data it might take twice as long as a class 4, thrice as long as a class 6, etc., which might matter if you're impatient and moving gigabytes of data. it should be more than fast enough for just listening to music. in my experience, i get higher than the minimum, and class 2 has been good enough for my dslr and recording 640x480 video on my compact camera.
462200
It IS Class 4. Slow, cheap, and reliable. I use it for computer back-up, not for photography or video .... where I want a high speed card.
407203
A class 10 drive transfers data at 10 10MB/s, this is a USB 2.0 and 3.0 Compatible drive, provided you have a blue USB 3.0 port on your computer, USB 2.0 runs around 30 MB/s and 3.0 in theory is 10x faster, but most likely will max out at around 100 MB/s. If you don't have a 3.0 port you would be better off buying a 2.0 thumb drive for less money.
812105
Its a Class 10 Card which means its fast. I can say it does write faster than other Class 10 cards I have. I have a 24 MP camera and even at its top quality setting I have never had to wait on it. It also works very well in the Video mode. And the price cant be beat.
265467
the "Class" represents the minimum transfer rate you should see with these cards.Class 4 = 4MB/sClass 6 = 6MB/sClass 10 = 10MB/sThere is an informative page on the kingston site at the following link:http://www.kingston.com/flash/sdhc.asp
545570
Probably class 10, with 20MB/s rate. See http://kb.sandisk.com/app/answers/detail/a_id/1996/kw/class%20rating%20of%20sandisk%20extreme%2032
982949
I am using USB 3 and performance is reasonable. Using Windows 8.1 Storage Spaces with full parity, I am getting ~20-40 MB/sec throughput on writes. I would recommend it for archive and backups. Not sure about the throughput yet for something like an active media server.
2233079
It's easier for me to c-n-p from a very informative site than try and explain in my own words;ClassThe other specification you'll notice in SD cards is the Class, which refers to the speed of SD card.Similar to CDs and DVDs, SD cards have certain rated write speeds. Class 0 cards are those that were designed before the Speed Class Rating was defined by the SD Association. Class 2 SD cards have write speeds of 2 MB per second. Class 4 is 4 Mbps. Class 6 is 6 Mbps, and Class 10 is 10 Mbps and so on.Hope this helps. This comes directly from here; http://sd-cards-explained.articles.r-tt.com/ It's easier for me to c-n-p from a very informative site than try and explain in my own words;ClassThe other specification you'll notice in SD cards is the Class, which refers to the speed of SD card.Similar to CDs and DVDs, SD cards have certain rated write speeds. Class 0 cards are those that were designed before the Speed Class Rating was defined by the SD Association. Class 2 SD cards have write speeds of 2 MB per second. Class 4 is 4 Mbps. Class 6 is 6 Mbps, and Class 10 is 10 Mbps and so on.Hope this helps. This comes directly from here;... » Read More It's easier for me to c-n-p from a very informative site than try and explain in my own words;ClassThe other specification you'll notice in SD cards is the Class, which refers to the speed of SD card.Similar to CDs and DVDs, SD cards have certain rated write speeds. Class 0 cards are those that were designed before the Speed Class Rating was defined by the SD Association. Class 2 SD cards have write speeds of 2 MB per second. Class 4 is 4 Mbps. Class 6 is 6 Mbps, and Class 10 is 10 Mbps and so on.Hope this helps. This comes directly from here; http://sd-cards-explained.articles.r-tt.com/ « Show Less
357275
Just got the 128GB version. Running Crystal Disk Mark 64bit - Sequential Read: 100.7MB/s Write: 100.8MB/s 512K read 25.2MB/s write: 57.11MBs 4K random read: 0.263MB/S write 0.943MB/s 4K random QD32 read: 0.457MB/s write: 0.694MB/s - Hope this helps everyone to decide!
1952348
From: PC: Intel Core2 CPU 6600 @ 2.4GHz (Windows 7, 64-bit) Port: USB 2.0 Card Reader/Writer: Kingston's MobileLite G3 To: SanDisk Extreme Pro 16 gb And an IMG file (2,478,505,984 bytes) I can reach 27 mb/second Note 1: maybe with a USB 3.0 port you can reach a best speed. Note 2: maybe without an adapter you can reach a best speed.
755742
It depends on your memory modules. 32GB seem to be the max and not for every speed. Here is a link: http://download.gigabyte.us/FileList/Memory/mb_memory_ga-z77x-up4-th.pdf
545502
From what I could find out, the higher the class the faster it can down load a picture to the card. Class 4 is 4 Mbps. Class 6 is 6 Mbps, and Class 10 is 10 Mbps
76290
It is rather confusing. On the link I provided, scroll down to the "Technical Details" part of the page. It reads "Minimum 20MB/ sec sequential read/write speeds." Best of luck!
92119
Like I said, just making sure. I found a good deal on an 8GB class 4, I think $12.50. Really, not much more expensive than class 2, so I figured: why not?
840824
Do not listen to Glussseppe G. about Class 10 MicroSD cards.. I am using the new SanDisk Ultra 32GB MicroSDHC Class 10/UHS-! at 80MB/s and it just works find.. Also the class 10 cards will work on any class 4 devices. You just can not use lower then 4 class cards like class 2...