USB 2.0 (Hi-Speed) is a USB specification that can transmit data at up to 480 Mbit/s.

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How to achieve highest performance with multiple USB 3 drives but only one USB 3 port

If a computer has one USB 3 port, and one USB 2 port, and the user needs to connect two external USB 3 drives (backwards compatible to USB 2), will highest speeds be obtained if the user connects them ...
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0answers
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How to limit the USB bandwidth a device can allocate on Linux

How do you put an cap on the amount of bandwidth a USB device can allocate on Linux? I have a couple of cheap USB webcams that I'm trying to running simeltaneously. Running v4l2-ctl ...
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1answer
17 views

Connection a Usb 2.0 driver to a usb 2.0 port using a 3.0 extension cable

I have a usb 2.0 Audio driver for my headphone and a usb 2.0 mouse, and i have 2 usb 2.0 ports and 2 usb 3.0 ports., I wanted to buy a usb extension for both of them because i need the extra length, I ...
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1answer
53 views

Occasional failure of USB device

Laptop is a ThinkPad T520, desktop is a ThinkCentre M series. Both use C200 Series Chipset Family USB Enhanced Host Controller. The failing device uses a Silicon Labs C8051F342 chip. I am testing a ...
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1answer
371 views

Why is there a speed increase when using a USB 2.0 device with a USB 3.0 port?

I know this question, or similar questions, have been asked before, but still I am curious… My laptop has two USB 3.0 ports and—on occasion—I will plug in a Western Digital external hard drive which ...
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2answers
92 views

How to ensure an external DVD drive will receive sufficient power from a USB port - before purchase [closed]

There are various external USB drives, some require external power supplies, some have optional external power supplies, some have 2 USB plugs, 1 for power and 1 for power + data. If I have a device ...
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1answer
81 views

Windows 8.1 sometimes does not recognize USB 2.0 connection on the front port

Windows 8.1 sometimes does not recognize the front USB 2.0 port on my machine. Any device that is connected to the front port are not even turning it’s light on. My mouse and keyboard work well and ...
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1answer
196 views

USB 3.0 hard drive in usb 3 port only recognized as usb 2 and detected only when connected to usb2

I have a WD MY Passport ultra 4TB usb 3.0 external hard drive. It does not function when I connect it to an usb 3.0 port, only usb 2.0 recognises the device. How do I resolve this issue?
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1answer
137 views

connect a usb only printer to router without usb port via usb to ethernet adapter

I have cisco linksys router which does not have a usb port and a usb to ethernet adapter. When I am trying to connect the printer to the router using the adapter the router does not shows the device ...
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0answers
86 views

Are some USB hard drive enclosures unsuitable for system drive use?

I have a number of hard drives in USB 2.0 enclosures. Some of these produce odd but consistent software failures when trying to use them as a Linux system drive. The problem appears to be tied to the ...
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0answers
134 views

ddrescue rates low (~20,000 kB/s) with ZFS content on a good drive, USB 3.0 limited to USB 2.0 with a 2009 MacBookPro5,2

I find a variety of questions in Stack Exchange concerning ddrescue data transfer rates. This question – involving part of a ZFS pool – may be exceptional. Briefly Four USB 3.0 Seagate hard disk ...
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0answers
84 views

USB hub advertised as 2.0 actually works as 1.1

I bought this USB hub http://www.ebay.com/itm/281298880612 which is supposed to be a USB 2.0 hub. When I plug a pendrive in to the hub, Windows gives the message "This device can perform faster if you ...
3
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1answer
59 views

How am I exceeding USB 2.0 speeds on a USB 2.0 port?

I am writing files to a USB 2.0 drive from a RAM disk, that has a 256MB random filled file on it (created from /dev/urandom to stop the file being compressed too much). When I look at the speeds of ...
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0answers
28 views

Mac OS X USB port recognized as 1.1 instead of 2.0

I have a Mac OS X v 10.5.8 and I use the USB device Terratec Cinergy Hybrid T XS to watch TV on it. This has worked fine until recently, but now it seems that the USB ports of my Mac are recognized ...
0
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1answer
77 views

Will a 10 slot USB3 hub provide full bandwidth for 10 USB2 flash drives, and if not, where is the bottleneck?

I am wondering if a USB3 hub connected to a USB3 motherboard could sustain 10 USB2 flash drives being used simultaneously to transfer data at full bandwidth. Theoretically USB 2 speed is 60 MB/sec ...
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0answers
12 views

Dont know how to connect AC-97, HDAUDIO, and USB connectors to motherboard [duplicate]

I'll provide pictures so you guys can see, but basically I recently bought a new case for my pre built lenovo k330b. I cant find how I'm supposed to position the connectors. Please help me out with ...
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4answers
3k views

Force a single USB 3.0 port to work as USB 2.0

I have several Dell XPS 13 machines that exhibit intermittent failures of the left USB 3.0 port, as described in this thread. I have lost data to silent corruption/disconnections on several external ...
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0answers
22 views

USB protocol: why SSPLIT transactions not allowed in microframe Y6?

In USB 2.0, the scheduling clock time base divides each millisecond frame into eight "microframes" that are 125 microseconds long. They are labeled Y0 to Y7. When a host is talking to a full speed ...
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3answers
5k views

Windows 8: How to change from USB 3.0 to USB 2.0

Is there a way to disable USB 3.0 and enable legacy USB 2.0 support on Windows 8? I have an old microphone (Blue Snowflake) that only works when plugged into a USB 2.0 port. Is there any way to ...
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0answers
129 views

What's the advantages of usb 3.0 compliant thumbdrive that doesn't have USB 3.0 speed performance?

I just learned that there are USB 3.0 compliant thumbdrives in the market that only support up to the maximum speed of USB 2.0 (nothing to do with using USB 3.0 device on USB 2.0 port here) and they ...
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2answers
62 views

What stats should I look out for when buying a fast USB drive? [closed]

What facts and figures should I look for speediest copying of single large ISO or multimedia files (700Mb to 4.5Gb)? Also, if a flash drive is the fastest USB-3 compatible device, can I assume it ...
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0answers
323 views

Can I Power the front-panel USB 2.0 ports with the power supply's 5V rail?

I have a high power (700ma+) USB device I wish to use on a single front-panel USB port. The USB specification in Wikipedia states: The USB 1.x and 2.0 specifications provide a 5 V supply on a single ...
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0answers
300 views

USB2 device incompatibility with USB3 computer

I have a new laptop with 2 USB2 ports and 2 USB3 ports. I have to use an USB2 RGB-D camera, namely the Softkinetic DS325. On my old laptop (only USB2 ports) everything is running as it should. On the ...
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1answer
733 views

Is it possible to use USB 3.0 Pendrive into my Laptop's USB 2.0 Port? [duplicate]

Currently I am having USB 2.0 port Laptop. I am in the plan to buy USB 3.0 Pendrive/External Hard Disk. Whether USB 3.0 pendrive/ext HDD will support USB 2.0 Laptop's port? Or it will have problem to ...
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2answers
75 views

Data speed on usb 1.0 vs 2.0

I have a CDMA USB dongle that I use for connecting to the internet. Now I plan to upgrade to a 3G dongle which has a USB 2.0 connection. Right now I have only USB 1.0 port on my computer. Will the ...
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2answers
356 views

windows 8 performance which is installed on USB SSD (boots from USB 2)

is any one here tried installing windows 8 to external USB SSD drive and booting drive from usb 2.0 port. i also want to install visual studio 2012 kind of ides and programming related softwares in ...
2
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2answers
841 views

Is there any advantage to using a USB 3 hub with USB 2 storage devices?

I have a host of USB 2.0 external HDDs that I'd like to plug into a single hub. Usually I don't actually access more than one at once, but you never know. Basically, I'm not sure how USB hubs work ...
7
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4answers
4k views

Would USB 3 make a difference for a USB 2 5400 RPM drive?

I've got a USB 2 5400 RPM external HD. I'm thinking of getting a new computer with USB 3 ports. If I'm currently getting read/write speeds from the external HD on USB 2 of roughly 30 mb/s (both read ...
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0answers
298 views

USB Wireless headset - Works in VMWare, not in host machine

Environment: Host - Win7 Pro SP1 64-bit VMWare Workstation 9.0.2 Guest - Win7 Pro SP1 64-bit I have two devices on USB 2.0 ports: a wireless headset from Logitech (H800) and a scanner ...
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2answers
414 views

USB 2.0 device in USB 3.0 Port

If I plug in an USB 2.0 device (e.g. mouse, keyboard) into a USB 3.0 port, will the controller still use polling to acquire input data (e.g. keypresses/movements) from the device?
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1answer
372 views

PNY 64GB Thumbdrive doesn't work in HP Envy h8-1414

I bought a 32 GB thumb drive (similar to the one below) and copied my wiki on to it using my Windows 8 laptop. I then plugged it into my HP Envy h8-1414 which has Windows 7 shoe horned onto it. ...
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0answers
249 views

USB 2.0 ports stop working, USB 3.0 port OK

I have a Windows 8 laptop (Acer V3-551-8489) that features 1 USB 3.0 port and 2 USB 2.0 ports. For some reason, the USB 2.0 ports stop working from time to time. Is there a way to restart those ...
2
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0answers
188 views

Installing USB Mouse on NF61S Micro AM2 SE?

I am using Windows XP sp3 and Windows 7 on NF61S Micro AM2 SE motherboard with AMD Athlon 64 X2 Dual Core 4400+, 2.31Ghz, 1.93RAM link for motherboard site; ...
2
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4answers
4k views

Is USB 3 backward compatiable? [duplicate]

If USB 3 is backwards compatible, why do they place USB 2 ports with USB 3 ports on motherboards? Also, do USB3 External drives not work with USB2 ports?
2
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1answer
240 views

Plug Computer Case USB 2 socket into mobo USB 3

I've got an Antec Fusion Remote Black Media PC case at home. The case needs two internal 9 pin USB headers to be fully functional - one for the USB ports on the front, and one for the LCD display. ...
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1answer
1k views

USB 3 stick in USB 2 port

If I plug a USB 3 stick (with 20/60MBps write/read speed) into a USB 2 port is it possible to get this speed (because USB 2 should be able to get 480Mbps = 60MBps)? I would assume that this speed ...
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2answers
281 views

Copying data between two external drives that support e-sata and USB 2.0. With one e-sata port, how achieve best speed file transfer?

Both read & write drives support e-sata and USB 2.0, but my PC only has one e-sata port. Does the choice between using e-sata for read or write drive make a difference in speed? This is on Windows ...
2
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2answers
23k views

USB 2.0-3.0, how do you tell the difference?

I know obviously speeds would be a key factor, but is there any spot on way to tell if a device is USB 2.0 or 3.0 such as a flash drive.
2
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1answer
639 views

How to enable USB 2.0 in Virtualbox 4.0.10, option for enabling EHCI is missing

I'm using Virtualbox 4.0.10 under Debian stable with Oracle VM VirtualBox Extension Pack 4.0.18r82821 to host an MS-Windows XP virtual machine for embedded software development. Unfortunately the VM ...
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2answers
3k views

Can I safely connect a USB 2.0/1.1 internal pin block to a USB3.0 motherboard header?

I've been working on my new PC build with the GA-Z77X-UD5H-WB WIFI motherboard. This board comes with a wifi/bluetooth card that goes into a PCIe x1 slot... but the card also wants to be connected to ...
3
votes
3answers
35k views

Extremely slow USB transfer speed

I am using Windows 7 32-bit, and have a Transcend 8 GB USB 2.0 flash drive. I have formatted the drive to NTFS using the Windows format tool. The problem is that when moving or copying files to and ...
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3answers
6k views

What downsides are there to running an OS off of a flash drive instead of a hard drive (USB 3.0 and 2.0) [duplicate]

Possible Duplicate: How does a hard drive compare to Flash memory working as a hard drive in terms of speed? I recently purchased a 16GB USB 3.0 flash drive, and I'm considering using it as ...
2
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4answers
22k views

USB 3.0 ports backwards compatibility problems with 2.0 devices?

I see some info on the net that suggest that I should be able to get my USB 2.0 devices to work in 3.0 ports. I only have two 2.0 ports on my new computer, and six 3.0 ports. I have installed ...
27
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5answers
65k views

Verifying USB connection speed (USB 3 or USB 2?)

I've purchased several new USB 3 capable drives to use with my new (USB 3 capable) laptop. They connect ok but I suspect they're silently falling back to USB 2. The sustained transfer rates I'm seeing ...
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2answers
6k views

What is the difference between USB 2.0 and USB 3.0? [closed]

I want to buy a Pen Drive and a HDD. For both case I get two categories. USB2.0 and USB 3.0. I wish to ask my T.V. is compatible with USB 2.0 pen drive. I wish to buy USB 3.0 pen drive. But that is ...
0
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1answer
608 views

low usb speed file transfer using KVM host CentOs

i'm using qemu-kvm(1.1.1) to run a Windows 2008 R2 Virtual Machine. The host machine is running CentOs 6.3. I'm exporting a USB 2.0 Hdd device to the VM using USB-redirection with spice channel. So ...
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4answers
7k views

Extend USB 3.0 cable

I have a couple of new USB 3.0 devices which connect to my USB 3.0 ports via the new "Blue" USB 3.0 cables that end in what looks like a USB 2.0 Type A connector. Indeed, the USB 3.0 devices will ...
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2answers
383 views

multiple USB 2.0 devices faster on USB 3.0? [duplicate]

Possible Duplicate: Using USB 3.0 to speed up transfer between USB 2.0 devices? I know USB 2.0 maxes out at 480Mbps, and USB 3.0 maxes out at 4800Mbps. Can multiple USB 2.0 devices tap ...
7
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1answer
14k views

Does a USB hub affect performance?

I have two devices I want maximum throughput and latency with. (Midi drums and midi keyboard for example) Would connecting both to the same USB port via a hub effectively limit the maximum data ...
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3answers
2k views

MIDI Over USB-Hub: Latency?

I am connecting an NI Maschine (hardware) over USB to my Macbook Pro. Right now I'm using a USB 2.0 powered hub (by DLink or Belkin, depending). It seems fine, but these things can be hard to detect. ...