back to article Kingston DataTraveler MicroDuo: Turn your phone into a 72GB beast

The Kingston DataTraveler microDuo is a convenient flash storage device that features a full-size USB interface at one end and micro USB at the other. The thinking here is that you can upload data to it from your computer or NAS box, and then stuff it into your phone or tablet for easy file sharing and to supplement any fixed …


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  1. bex

    Unless the full sized end is made from something more sturdy than the plated pressed steel its expensive trash waiting to happen

    1. Gordon 10

      Eh? What do you do with your USB keys jump on them or do you just have ham hands? I've had some cheap pressed steel ebay chinese tat ones attached to my keyring for years that have gone a bit bendy - bend them back roughly into shape and they still work perfectly.

  2. JDX Gold badge

    Apple's Camera Adapter kit ... a rather expensive diversion.

    Not really, you can get a 3rd-party one for £5. Although you can use it to 'side-load' videos onto the device, it's a bit slow and cumbersome from my tests unfortunately.

  3. Magnus Ramage

    Wish I'd seen this before I bought a 16GB Moto G a couple of weeks ago!

  4. Avatar of They
    Thumb Up

    I don't get it. Can someone answer if you have one?

    So it contains a Micro USB drive of around 8, 16, 32GB etc, AND can also allow you to plug in another USB drive?

    So I could buy the 64GB one of these AND then plug in a normal USB pen drive? (upto another 64GB?)

    Otherwise what is the slot for on the outer edge?

    If you can it removes me having to carry an annoying adaptor cable for USB pen drives to plug into my phone.

    1. Jim 48

      Re: I don't get it. Can someone answer if you have one?

      The other end is a USB-A male connector so you can attach it to your computer, allowing you to copy items from & to the device.

      1. Avatar of They
        Thumb Up

        Re: I don't get it. Can someone answer if you have one?

        Ahhhh, of course, makes sense.

        Cheers for pointing out the obvious flaw in my understanding.

    2. Arachnoid

      Re: I don't get it. Can someone answer if you have one?

      Nope its just a standard USB drive with two ends one standard and one micro if you were to plug a.n.other drive into it you would need an adapter and the software may have issues recognizing the second drive.

      My issue with this type of drive is the poor protection they have on the connection side after all its banging around with keys and change in your pocket all day.

      1. Dave 126

        Re: I don't get it. Can someone answer if you have one?

        Exactly. Reports of using USB thumb drives with a microUSB > Female USB A cable suggest that thumbdrives vary in their power consumption... i.e, some work with phones, but some just don't.

    3. thomas k.

      Re: I don't get it. Can someone answer if you have one?

      My reading of the article is that this is a flash drive with both standard USB and micro-USB connectors built in, thus eliminating the need for the annoying adaptor cable.

      PNY makes very tiny USB flash drives, barely larger than the USB connector itself, so paired with a very short cable it's not much more inconvenient to use use that this device would be.

  5. LordPakal

    USB 3 Option

    This is the same beastie, but with USB 3. I use it with a Motorola Moto G and it works flawlessly.

    About £40 for the 64GB version if you shop around.

    1. Phil W

      Re: USB 3 Option

      Nice idea but surely if you're going to make a USB3 version you should make one with Micro USB 3.0 OTG support. Would be nice for my Note 3.

    2. Gordon 10

      Re: USB 3 Option

      Presumably the USB 3 interface only works on your PC? Are there any phones that support it?

  6. Dave 126

    If in doubt...

    ... about whether your phone will work, then XDAforums is a good place to check. It will appear high in the Google results for "[My Phone Model] USB OTG support" anyhows.

    1. Phil W

      Re: If in doubt...

      Or check on gsmarena they are good at listing all phone specs, including USB OTG support.

  7. Timmay

    Or if mass storage is important to you on your mobile, get a (proper) phone with a MicroSD slot, and bung in a 64GB card.

    1. Anonymous Coward
      Anonymous Coward

      which will die in 2 weeks.

      ..if I touch it.

      I guess I could pay someone to buy me another 64GB card and put it in my phone for me.

      1. Havin_it

        Re: which will die in 2 weeks.

        Don't blame yourself (unless you've done that to, like, a lot of cards). I had one do the same, but the next one's been fine for more than a year, touch wood.

        I think that just illustrates how flaky the bleeding-edge flash tech is. It's only on the market at all because the beancounters worked out that $revenue > $cost-of-return * incidence-of-failure.

        Same reason I tend to steer clear of stupidly-high capacity thumb drives (well, that and the lack of a real use for one).

        Can't see much use for this widget either, but at least I learned my SIII has USB OTG - wouldn't have expected that, wonder what else I can do with it?

        1. Timmay

          Re: which will die in 2 weeks.

          @ theodore - buy from a reputable brand, from a reputable dealer, at least you can replace it under warranty if the worst happens. Only time I've heard of MicroSD cards dying is when buying dirt cheap (knock offs) from eBay, from China (for example)

          Besides, who's to say this USB device won't be as unreliable.

  8. Arachnoid


    Trouble is some phones and tablets like my HTC One and Nexus 7 both excellent devices,are internal memory only.So its not just the fruit bearing variety that have this design issue.

    1. eszklar

      Re: MicroSD

      Time to get a new HTC One (M8) with microSD support? As to the Nexus 7 (which I personally own) I've been looking very closely at the Samsung 8.4" TabPro - unless you need cellular in your tablet.

    2. thomas k.

      Re: MicroSD

      The Nexus 7 does support USB OTG vie the Nexus Media Importer app in the play store.

      Not sure what the change to external storage with KitKat entails, however.

      1. Anonymous Custard

        Re: MicroSD

        On my 4.4.2 Kitkat N7 (2012) the media importer app is still required for USB OTG.

        Somehow I don't see that changing whilst Google are trying to flog paid subscription to their cloud drive...

  9. Anonymous Custard

    Even cheaper?

    Or alternatively go on Amazon or wherever for an OTG cable for a couple of quid, then just use one of the many full-sized USB thumb drives that most people already own?

    This thing makes sense if it's going to be (semi-)permanently stuck in the phone or if you are in the market for a new thumb drive for whatever reason, but from experience for most uses just hooking up to a cable works well too and saves buying yet another drive.

    That said for general travelling I use a Ravpower filehub and a WD hard drive, which turns both my Windows Phone and my Nexus7 (and my work laptop) into shared 2TB wifi beasties instead.

  10. Paul Shirley

    worried about damaging the USB port

    Very nearly bought one yesterday before deciding having even a shortish stick hanging off the charging port is risky, too much leverage as it flexes and chance of damaging the port. Really needs to be much smaller or at least flatter to cut down the flexing. Instead I'll be trying an OTG cable adaptor and normal stick.

    Someday there'll be the right combination of form factor, speed & price but this falls a little short.

    1. Anonymous Coward
      Anonymous Coward

      Re: worried about damaging the USB port

      "Someday there'll be the right combination of form factor, speed & price..."

      Yep. It'll be a phone with built in 128 Gb storage for an extra £50 over the current prices. If I can buy 128 Gb for £60 retail markup, tax and distribution included, there's no reason why idiot phone makers couldn't do that instead of sticking in 8 or 16 Gb (which requires just the same package and interface as a properly sized lump of storage).

      The only explanation is a "640k is enough for anybody" mindset amongst mobile phone hardware designers, accompanied by the marketing teams' desire to ream out the more gormless customers with "propositions" like £60 for an extra 8 Gb.

      1. Anonymous Custard

        Re: worried about damaging the USB port

        there's no reason why idiot phone makers couldn't do that instead of sticking in 8 or 16 Gb

        Unfortunately in reality there is reason, namely if punters who know no better are willing to pony-up 3x the price for it to be built-in. Or that they can then sell their own cloud storage solution as an alternative, thus generating their own captive market (looking at you Google and Amazon).

        There shouldn't be a reason, but greed and profit will trump any kind of logic like that.

  11. handle

    500mA power draw

    It won't draw 500mA - at least not continuously. Something that size dissipating 2.5W would be red hot. Presumably it (probably erroneously) identifies itself as a high power USB device - requiring 500mA as opposed to 100mA low power - which is why you get the warnings.

    1. Brenda McViking

      Re: 500mA power draw

      I don't know - you try holding a 64MB MicroSD card that has just completed a few 10GB file transfers at 50MB/s - it actually gets very hot - too hot to apply any kind of pressure to with your fingers, anyway.

    2. Havin_it

      Re: 500mA power draw

      It won't usually draw that much, but if it's rated that high then it probably means it may do so occasionally.

      I had such a problem with a Raspberry Pi and some bog-standard thumb drives: the Pi puts out 100mA per port, but the drives were rated 200mA in both 8GB and 16GB capacities (same brand). With the 8GB ones I had no issues in a couple of months, but when I changed to the 16GB I suffered a power-shortage-based drive error within a week.

      The workload of that rig was mostly random reads seconds or minutes apart, but varying wildly in size; I'm guessing it was a longer read that pushed it. If you're streaming a movie off this thing, I'd bet it'll max out a few times...

      1. handle

        Re: 500mA power draw

        You can only infer that it draws more than 100mA some of the time.

  12. berserko1

    Works great on my BlackBerry Z30.

  13. gbru2606

    I wonder...

    I have a Nexus 4 and use a Ravpower device to backup over WiFi. It won't power a USB but a hack does allow the phone to back up and restore via USB as long as it's externally powered with a y-cable. I wonder could I power this through the standard port while the phone is connected at the other end? Might be a little less messy than my current y-cable and Ravpower setup.

    1. Anonymous Custard

      Re: I wonder...

      Which Ravpower device?

      My RP Filehub will happily power a WD MyPassport hard drive through its USB port as well as hosting an SD card, acting as a portable WiFi NAS for my HTC 8X and Nexus7...

  14. Justicesays

    To be fair to the Nokia 820

    It does have a microSD card slot, so the ability to attach USB-OTG storage devices won't be a huge priority for the owner, as compared to some of the non-slotted 8GB droid or apple phones

  15. Clive Galway

    Can both connectors be used simultaneously?

    If you plug the micro end into a phone and the A end into a PC, can both the phone and the PC see the storage at the same time?

    1. This post has been deleted by its author

  16. NoOnions

    I disagree with the 'get the 8GB phone' arguement.

    You need as much internal memory as you can afford.

    My Samsung GS4 has 'only' 16GB. Apps such as the BBC's iPlayer and Sky Go will only download shows and films to internal memory. They will not use the 64GB card I've added to the phone. You very quickly run out of space and with 8GB it would be even worse!

  17. Heisenberg

    Aesthetically, it's an abomination...

    I think I must have been buying my gadgetry from a certain fruity firm for too long 'cos I would not buy that thing on looks alone, it reminds me of something the dog coughed up on to the kitchen floor.

  18. Tom 7

    Great for on the go

    where on the go means not actually going until you've dismounted it and unplugged it so you can put your phone in your pocket and then go without breaking the connector.

    I think I'll stick with a wireless drive that I can keep in my pocket/bumbag and still access - and it can have a fuckoff battery pack if it has to!

  19. batfastad









    Sorry about the shouting but it's just incredibly annoying that it seems most smartphones now don't seem to have MicroSD slots.

    I bought an 8GB Moto G. Great phone but only 5GB is actually usable by the user, even then there's a bunch of Google bloat on there taking another 500MB

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