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Questions tagged [usb]

Use this to tag for questions about the USB interface or devices connected via USB.

Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad variety of USB hardware exists, including 14 different connector types, of which USB-C is the most recent and the only one not currently deprecated.

2262 questions
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What is "BC 1.2 port"?

This story about a new Thunderbolt 3 dock from Promise Technology shows one of the two USB 3.0 ports labeled “USB 3.0 BC1.2”. Some searches show results for "BC 1.2 port" but I've not yet seen a definition or explanation.
Basil Bourque
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5 answers

.Trashes folder on USB won't delete

I am trying to delete files off my 8GB USB Cruzer device, as I often put movies on it to watch on my PS3. When I plug it into my PC, I can delete files off it fine, but when I plus it into my Macbook Pro, it creates a .Trashes folder. When I put the…
user46404
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votes
4 answers

Best, or best supported, USB-Serial adaptor for OSX

I have various devices to connect to my iMac using good-old RS-232. Of course, I only have USB connectors on my machine. I have a couple of Prolific PL2303-based cables, and they seem to work OK, but the kext provided seems a little flaky and I'm…
sdg
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1 answer

Why are there no hubs for the new USB Type-C Port?

I'm assuming there is some sort of technical limitation. Why is it that all the usb-c hubs are passthrough single usb ports instead of a USB Type-C multiple port hub?
Dobler
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4
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1 answer

Use the bundled USB-C cable with Target Mode

Can I use the white USB-C cable provided with new MacBook Pro to copy files from my MacBook Pro to another one, even if the transfer rate is poor?
Lucas
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3
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0 answers

USB drive won't mount

I'm having a problem with a USB thumb drive that I used to be able to read and write to with no issues. On two different Macs: MacBook Pro and iMac, it doesn't mount. It doesn't even show up in DiskUtility. The only thing that happens when it gets…
onlynone
  • 153
3
votes
1 answer

Burning CD images to Bootable USB

Why can I copy a Linux ISO directly to a USB using dd, but in order to make a bootable USB using a FAT32 filesystem I need to convert the ISO to an UDRW image?
Kyle
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3
votes
1 answer

USB to serial Adapter not working after upgrade to El Capitan

I have been using a TRENDnet TU-S9 USB to serial adapter for a couple years. When I upgraded OSX from 10.10 Yosemite to 10.11 El Capitan, it stopped working. I've tried reinstalling the driver, but that did not fix it. I ran ioreg -p IOUSB and…
amath
  • 133
2
votes
1 answer

USB C hub temperature

I just replaced my 6 year old MBP with a new 16" MBP which requires the addition of adapters to connect just about anything external. So I got a USB-C hub with HDMI, RJ-45, USB-3.1 and SD card connectors. If it helps, it is from Networx, model no.…
Peter Kämpf
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Assign serial number to USB device

I have 2 identical USB devices (Zoom F8 multitrack field recorders) which connect as a standard audio interface. I'd like to create an aggregate device using both devices. macOS definitely "sees" both devices: $ system_profiler SPUSBDataType ... F…
howecome
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votes
1 answer

Is there a limit to the number of USB and Serial to USB devices my Macbook Pro can connect?

I'm curious if there is a limit to the number of usb and serial to usb devices my Mac can connect to. I've got a 2015 Macbook Pro running 10.10.5 and I'm writing a python program to connect to a bunch of serial devices which I have connected to a…
clifgray
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2
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1 answer

USB port not functioning on a user account, works on another

This is a 15" MacBook Pro (Early 2011 model). In one user account, only a single USB port works. When logging into another user account, both USB ports work. What could be causing this? What would you advise as a fix (short of rebuilding the user…
Bradley Chambers
  • 475
2
votes
1 answer

Which kind of USB device attached - equivalent for the full functionality of lsusb on macOS?

Neither 1) System Information, 2) ioreg -p IOUSB -w0 -l, 3) system_profiler SPUSBDataType nor 4) jlhonora's "lsusb" for macOS (brew update && brew tap jlhonora/lsusb && brew install lsusb) tell me which kind of USB device is attached like the Linux…
MmmHmm
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2
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1 answer

Why does the name of my flash drive change whenever I demount, then remount it?

I have a LaCie key (iamakey). When I change the drive's name to "LaCie" then dismount and remount it, it's name changes to "LACIE" I'm trying to figure out why it won't stay named as "LaCie" Any ideas?
James Litewski
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2
votes
2 answers

Salvaging a Flash Drive that won't mount and Disc Utility can't erase, restore or repair

I have a Centon Flash Drive that will not mount. It is not readable on the iMac nor a Windows 7 machine. The drive cannot be reformatted by the Windows or IMac usual methods that this layman tried. In another thread about this subject I've…
Paul
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