USB stands for Universal Serial Bus and is a general and universal interface standard for connecting computers and electronic devices.

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165
votes
17answers
333k views

How do I place a bootable ISO on a USB drive?

What's the best way of placing a bootable ISO on a USB drive, such that the drive is bootable? ISOs such as a live Linux preview disk, Windows installation ISO, etc.
108
votes
14answers
277k views

How do I figure out which /dev is a USB flash drive?

I want to mount a USB drive, two of them and I need two different mount points. Unfortunately, the Linux kernel underwent a name change and I can't figure out which /dev location is the right one. Is ...
101
votes
1answer
17k views

I accidentally plugged my USB mouse into my eSata port… it works?

I'm on a Thinkpad T510 and I accidentally plugged my Razor USB mouse into the eSata port not realizing my error because it has been working fine this whole time. Does this seem a little odd?
95
votes
9answers
10k views

What is the rationale behind safely removing USB media from windows PCs? [duplicate]

Quite often when I'm in a rush, I automatically pull out a USB pendrive or USB cable from an external hard drive from my desktop PC or laptop, without right-clicking on the safely remove icon in the ...
94
votes
6answers
48k views

Should I plug my mouse into a USB 3.0 port?

I'm looking for an authoritative answer, backed by data. A friend asked me the other day whether he would benefit from plugging his mouse into a USB 3.0 port instead of an available 2.0 port. I ...
76
votes
9answers
12k views

Unplugging USB hard drive can damage computer? Seriously?

I’m reading through the manual for a Samsung portable USB hard drive, and I’ve come across this warning: Detaching the USB cable while file transfer is in progress can damage your computer ...
68
votes
3answers
8k views

Does a USB 3.0 connection require a USB 3.0 cord?

Does a USB 3.0 connection require a USB 3.0 cord to reach USB 3.0 speeds (SuperSpeed)? Will any USB cord support any USB 3.0 device?
66
votes
7answers
11k views

Does a computer use more electricity when charging USB devices?

Something I've always wondered. If I constantly hook up cellphones, hard drives and the like via USB to my computer, will it eat up more on the electricity bill? Or are the USB ports using up ...
63
votes
6answers
23k views

Using UDF on a USB flash drive

After failing to copy a file bigger than 4G to my 8G USB flash drive, I formatted it as ext3. While this is working fine for me so far, it will cause problems if I want to use it to copy files to ...
62
votes
7answers
79k views

Install Windows 7 from USB flash drive

I have an ISO image of the Windows 7 installation DVD, but I can't burn it to CD or DVD. I have an empty flash drive with plenty of space. Is there any way I can put the ISO image on it and install ...
60
votes
4answers
11k views

Opened up a USB stick and it looks a bit odd

We opened up the case of a USB stick (that didn't work before we opened it) and it looks like this: Has the memory been taken out of it or do some USB sticks actually look like this? Note that it ...
48
votes
3answers
56k views

How do you check how much power a USB port can deliver?

Some laptops have a special USB port that can deliver more power than the other ones. However it is not always easy to identify which one is the good one, nor how much power it can deliver. So is ...
46
votes
7answers
269k views

Why is my USB mouse disconnecting and reconnecting randomly and often?

My mouse will reconnect/disconnect (will even hear the sounds from Windows), and the light on the bottom of the mouse will turn off/turn on as it starts working again. It really sucks to be playing a ...
44
votes
4answers
124k views

Why can't I delete all partitions on a flash drive in Windows 7?

Recently I purchased an ADATA C802 8GB flash drive. Since the drive was new I decided to run some of the HD Tune Pro (v4.50) performance tests on it, mostly just for the heck of it. To avoid ...
44
votes
6answers
15k views

Using USB 3.0 to speed up transfer between USB 2.0 devices?

I've noticed that transfers between USB 2.0 drives are usually very slow. From what I understand, this is because all USB 2.0 devices connected to the same USB 2.0-host share the same 480Mb/s of ...
43
votes
10answers
8k views

Should I unmount a USB drive before unplugging it?

When you unplug an USB drive without unmounting, your OS warns you about how dreadful could be such operation for your devices (I'm on OSX). I usually follow the advice, unmounting before unplugging, ...
42
votes
14answers
67k views

Are USB headphones/headsets inferior to regular ones?

Some headsets use an USB connection instead of connecting to the motherboard's regular audio output jack. Does that make them inferior in any way to other headsets? What about USB 2.0? I'm looking for ...
41
votes
13answers
356k views

If USB is not listed in BIOS as a boot option, does that mean the machine can't boot from USB?

I just purchased an Asus Zenbook Prime UX31A-DH51 with Windows 8. I want to wipe the drive and do a clean install but USB is not listed as a boot option in the BIOS. Does this mean it is not possible? ...
40
votes
4answers
5k views

Is there any danger when connecting a USB Y cable?

I have been advised to use a USB Y cable to power a portable hard drive from 2 ports since it could not draw enough power from a single port. Is there any danger of overloading the drive this way?
38
votes
9answers
269k views

How to find out which USB port is USB 3.0?

In my laptop (a Lenovo y470 ) there are three USB ports. One of those is USB 3.0 others are USB 2.0 . I do not know which one is what. When I copy data from my External HDD it transfers at 38MB/s from ...
38
votes
2answers
16k views

Why does my computer go “New USB device” every time I plug one into a different port?

Let's say I have a mouse. I plug this mouse into slot 1 out of 4 on a computer. It goes through the new device detected and all of that, which is fine. But if I come back later with the same mouse and ...
38
votes
3answers
262k views

What is the power output of a USB port?

As the title says, what's the power output of a USB port? Is it a standard value, or it may change depending on manufacturer/model, and so on? If that value is not standard, how can one determine ...
37
votes
1answer
98k views

Change default action on connecting a USB device

I've a device I connect to my windows computer (in this case it is an iPod but I don't believe that matters). Often when I first connect such devices a dialog will pop up giving a list of actions ...
37
votes
4answers
39k views

USB-Sticks and multiple Partitions

I've got an USB-Stick with multiple Partitions on it (FAT32 (active), FAT32, Ext2 but that's another story) and it seems like that my Windows XP can only mount the first partition of the stick. If I ...
33
votes
3answers
50k views

What does “Legacy USB Mouse” support in a BIOS mean?

What does a "Legacy USB Mouse" option in a BIOS mean? Yes legacy usually means older revision, or obsolete. So legacy usb mouse means support for "old style usb mouses". That's not really ...
32
votes
3answers
100k views

Flipping the Removable Media bit — alternatives to BootIt? [closed]

There's a utility called the Lexar BootIt utility that flips the Removable Media Bit on certain USB flash drives. I want to flip the bit on my USB flash drive (it's supported) but really am not too ...
31
votes
3answers
97k views

Windows 10 is unable to load Android devices as MTP devices

I had recently upgraded my laptop from Windows 8.1 to 10. Since the upgrade, I am unable to connect my Android devices as MTP (or Portable Media Player) devices on Windows. The devices that I am ...
30
votes
3answers
74k views

16 GB USB flash drive capacity down to 938 MB

After writing the FreeNAS IMG to a 16 GB USB flash drive, I can now only use 938 MB. I used the Win32 Disk Imager tool to write the IMG to the device. Then later, when I inserted the the USB drive ...
30
votes
3answers
453k views

Create a bootable USB drive from a DMG file on Windows

A Mac machine needs to be reformatted with Lion. I backed up the Lion dmg file when I purchased it via the Mac App Store. I now need to create a bootable USB drive from the DMG file but I need to be ...
30
votes
6answers
101k views

How can I get the mount path of a USB device on OSX?

I have a backup script that backs up some data to a USB device. The problem I have is that OSX sometimes changes the expected mount path. For example if some file is locked under the expected mount ...
30
votes
8answers
10k views

Booting Linux off USB pendrives

Booting a Linux system off USB Pendrives is one of my favorite things. On a laptop we have the following advantages, The Harddisk can be shutdown and that reduces power consumption (hdparm) The ...
29
votes
5answers
4k views

Why does an 8 GB and 16 GB USB drive have the same physical size but a different amount of storage? [closed]

In the market, you can get USB drives of different storage sizes. However, among the same brand, I found that those USB drives are physically the same. How can they achieve this? Is it that different ...
28
votes
5answers
8k views

The Flight I am taking has USB ports for power… how can I use it to charge my laptop? [duplicate]

Possible Duplicate: Charge a laptop via USB power (500mA)? I will fly to China in the next month which will take a mammoth 18 hour flight. The plane has USB power source on it. I know USB ...
28
votes
6answers
301k views

How to create a bootable USB Windows OS using Mac OS X

I'm having a trouble here because of my PC got infected today and I've tried everything to get it back to normal, but the only option left for me now is to do a clean install. Now, what happen is ...
28
votes
5answers
22k views

Installing Windows XP from USB pen drive

I want to install Windows XP on my desktop computer (only XP) but my CD drive is not working. I've only found installation tutorials on how to install it on the pen drive rather than from the pen ...
27
votes
10answers
176k views

What's the maximum typical speed possible with a USB2.0 drive?

I'm getting only 30MB/sec between my computer and a USB drive, despite the fact that USB 2.0 supports 480Mb/sec (or 60MB/sec) transfers. (Therefore, I'm only getting half the rated speed) Is there ...
27
votes
3answers
22k views

How can I keep multiple live/bootable ISO images on a single USB drive?

I am looking to create a USB flash drive that I can put multiple live CD ISO images on and select which boots from startup. The ideal candidate supports Linux and Windows-based ISO images, and is ...
26
votes
14answers
116k views

Why does Windows 7 ask for additional drivers when installing from a USB 3.0 drive?

I just bought a new config ( ASUS p8z68-v lx, i5-2500k + ram and new graphic card ). Coming back and installing it in my old computer, I just saw that my DVD player was on IDE (yup…). So, I needed to ...
26
votes
3answers
125k views

Maximum length of a USB Cable?

I want to use a very long USB cable to place a webcam in a different room. The maximum length that I found was five meters. What is the maximum length of a USB cable? What is the maximum length ...
25
votes
11answers
129k views

How long would it take to transfer 1TB over USB 2.0?

This might be a completely stupid question because it is conceivably highly dependent on the respective disk speeds. But I am thinking that there is a speed cap that is specific to USB 2.0 that would ...
25
votes
4answers
26k views

Do USB or PS/2 keyboards respond faster?

Do USB or PS/2 keyboards respond faster in terms of end-to-end input latency, keystrike to character appearing on the screen? Related: Under either connection, is the time between keystrike to ...
24
votes
6answers
164k views

How to detect if a USB port is 3.0 or 2.0?

I have a Toshiba Canvio 3.0 external HDD. It has USB 3.0. It flashes blue if you connect it to a USB 3.0 port. If it is a 2.0 port, the light becomes white. Yesterday, I plugged it in and the light ...
24
votes
5answers
191k views

How do I burn an ISO image to a USB flash drive? [duplicate]

Possible Duplicate: Place a bootable ISO on a USB drive? What is the best way to burn an ISO image onto a USB flash drive?
24
votes
3answers
45k views

Is there a USB wall charger that “just works” with every device?

Background Almost every gadget today is charged over USB. It seems like a good idea since everyone has a computer with USB, but fumbling behind a computer and making sure that computer is on and does ...
23
votes
3answers
3k views

Why must I install drivers BEFORE plugging in a new peripheral?

I've always found this to be curious about installation instructions for computer peripherals; most commonly, installation of USB hardware in Windows XP. Installation instructions typically insist ...
23
votes
2answers
2k views

5400rpm HDD speeds in a USB 3.0 connectivity enclosure

I plan to replace my laptop's 5400rpm HDD with an SSD in the near future. I then want to make the old HDD an external HDD. I want to get it to work with USB 3.0. Will I get better speeds from my ...
22
votes
5answers
47k views

Why does 'dd' not work for creating bootable USB?

Recently I wanted to create a bootable USB of Linux mint. I found that there was a lot of conflicting advice/experience about whether the 'dd' command could be used to create a bootable USB. I decided ...
22
votes
5answers
39k views

How can you tell a USB cable version?

Here is a question a student asked me in one of my A+ certification classes: How can you tell a USB cable version? I honestly dont know the answer, I cant find one either. USB cables are rated for ...
21
votes
4answers
31k views

How to speed up rsync?

I'm running rsync to sync a directory onto my external USB HDD. It's about 150 gigs of data. 50000+ files I would guess. It's running it's first sync at the moment, but its copying files at a rate of ...
21
votes
6answers
3k views

How can I test if a USB thumb drive is fake?

I bought a 256GB USB stick for only $5 on eBay. I know: What could possible overwrite your sense of "hey wait a minute" as a technology person would make you think you could buy a 256GB flash ...