Does the W3 support UHS1?

elemein
elemein Member Posts: 20 New User
Thinking of getting a W3 (32 GB. Cant get 64 GB version as I'm in Canada) and a 64 GB UHS1 microSD card, such as one of the Sandisk Extreme or Ultra ones or whatever with 50 MB/s+ reads and writes.

Does the W3 support UHS1 and it's speeds?

Answers

  • padgett
    padgett ACE Posts: 4,532 Pathfinder

    Yes and no. It will read the drive but speed will be limited to USB 2.0 (SD card slot also). Know true of a 32GB drive but haven't had a real 64GB to test yet.

     

    CR 23.55 MB/s read, 15.99 MB/s write 32GB SD U1.

  • elemein
    elemein Member Posts: 20 New User
    Thank you for you reply.

    Why USB 2.0 speeds? What is the connection between microSD and USB 2.0? I thought they were completely different ports with different standards?

    What is the maximum read/write speed of USB 2.0? I want to know because I want to get as fast speeds as possible (but I dont wanna waste money on extra speed that cant be utilized) because I will be loading programs onto the microSD and I dont want load times to be too slow.

    Thanks again!
  • padgett
    padgett ACE Posts: 4,532 Pathfinder

    I have just found that a U1 SD card is about the same speed whether in the socket or in a USB carrier. I suspect for memory it uses the same drivers.

  • elemein
    elemein Member Posts: 20 New User
    Sorry, I was asking about a UHS1 microSD card, not a full size SD card. Also, I will be using the slot espiecally for microSD cards.
  • padgett
    padgett ACE Posts: 4,532 Pathfinder

    That is what I was talking about - micro SD cards (logically they are all the same). The CR speed was the 32GB micro SD in my W3.

     

    SD/flash drives always seem to do better at reading then writing, SSDs are slightly the revese. I ran quite a few tests with my 510 and was the same as the W3 (same chipset) and all removable drives peaked around 23 MB/s including a 120GB SSD that could hit 151.7 MB/s on a USB 3.0 hub. In comparison the internal SSD peaks at about 59 MB/s.

     

    I believe that the real issue is power and 3.0 devices use near double the power of 2.0 (spec. is 500 ma vs 900 and Clovertrail devices seem a bit weak there - pull any real power and it overtemps/shuts down. This is why if using more than a keyboard and flash drive I use a powered hub.

     

    ps 23 MB/s is the same as 184 Mb/s have to keep track of whether the speed is in bits or Bytes and the best numbers are from sequential reads.

  • elemein
    elemein Member Posts: 20 New User

    So I guess the limit is 23 MB/s, even if you are using the dedicated microSD slot?

     

    Also, I wont be using the USB port for keyboard/mouse, I'll normally be using a bluetooth keyboard and a bluetooth mouse. The USB port will only be there for when I need to use a USB flash drive or charge my phone, otherwise it wont be used. 

     

    The main drive of the W3 will be used for all my main programs and such, while the microSD will carry my games and be my main storage drive. 

  • padgett
    padgett ACE Posts: 4,532 Pathfinder

    Makes sense, have the W3 hooked to my KVM through a powered hub but have a BT keyboard/trackpad that fits in an eyglass case for portable. It is getting really close to "drop in your pocket" now.

     

    BTW Windows to Go takes about 45 seconds from cold to boot even with BitLocker running from a flash drive. I consider that adequate for now.

     

    Stongly suspect that some trades were made in performance vs battery life. All we need is better batteries.

  • elemein
    elemein Member Posts: 20 New User

    Yeah, the whole goal of this device for me was definitely a "go anywhere" computer that didnt take up much space, so bluetooth was definitely necessary.

     

    Whats KVM? 

     

    What is Windows to Go by the way? And Bitlocker?

     

    I think the 7-9 hour battery life is fine. I cant imagine needing anything that the USB OTG cant power as long as you have a BT mouse and keyboard.

  • billsey
    billsey ACE Posts: 34,601 Trailblazer

    KVM stands for Keyboard, Video and Mouse. It's a device that lets you hook one of each up to several computers, switching between them at will.

     

    Windows to Go is a new feature in Windows 8 Enterprise that allows to run your operating system off of a thumb drive. That lets you have everything you are used to running on any fairly modern computer.

     

    Bitlocker is a feature of Windows Pro and Enterprise that allows you to encrypt your data so no one else can access it.

    Click on "Like" if you find my answer useful or click on "Yes" if it answers your question.
  • elemein
    elemein Member Posts: 20 New User
    Oh wow, thank you very much. Even though I dont believe I'll be using those features, its nice to know they exist. Windows To Go interests me.
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