dirkt
  • Member for 7 years, 7 months
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Can a USB hub be used to access a drive from two devices?
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68 votes

No. USB by design can only have a single host (one PC). What you can get is a kind of "switch", often combined with a USB hub. Then you can connect two PCs to it and manually switch between them. But ...

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What can cause a USB 3.0 port to revert back to USB 2.0?
55 votes

If you have a look at the USB 3.0 pinouts, you'll see that the USB 2.0 lines are distinct from the USB 3.0 lines. So when the USB 3.0 lines are interrupted, or their quality is so bad that data ...

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Can my network administrator know that I am using a virtual router to access the internet on my unauthorised devices?
38 votes

Besides physically running around and detecting hotspots via WLAN traffic ("warwalking"?), or maybe using the existing router to detect then, traffic patterns can also be a giveaway - your hotspot has ...

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Cat5 socket wiring issues
28 votes

TL;DR: Yes, you can just follow the colours on the back of the sockets. Expanded answer: Ethernet uses four pairs of wires with differential signaling. In the cable, the two wires in a pair are ...

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Do 60 FPS GIF's actually exist? Or is the maximum 50 FPS?
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26 votes

The GIF98a specification says in the section about the Graphics Control Extension vii) Delay Time - If not 0, this field specifies the number of hundredths (1/100) of a second to wait before ...

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Why are networks designed for TV better at providing the show when they use same medium as internet?
23 votes

The actual medium is not the same: TV distributed via dedicated coax works very differently and has a very different infrastructure compared to, say, watching Youtube or Netflix, or anything else over ...

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Can an HDMI cable carry a mouse a keyboard signal?
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23 votes

No, HDMI cables don't support this functionality. HDMI does have a backchannel (CEC) which in principle could be used to carry mouse and keyboard signals, but I don't know of any hardware which ...

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CD-ROM subchannel is different when dumping the same disc?
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15 votes

The various CD formats are a bit involved, and the official specifications ("red book" for audio CD, "yellow book" for data CD) are not freely available. But you can find some details in available ...

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Mount a folder with a space on Linux
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13 votes

This probably should be sudo mount -t cifs ..., note the t. There are various ways to deal with spaces and special characters (see man bash for details), one way is to use single quotes: sudo mount ...

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Can you partition a floppy disk?
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12 votes

You certainly can partition a floppy. Nothing prevents you from doing it, and it should work just fine on Linux when you mount it. But given the small amount of data you can store on a floppy, having ...

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In 802.11n, is it possible to have MIMO on single antenna?
12 votes

MIMO works by using the fact that on antennas in different places, the radio waves will arrive with a slightly different phase. And this phase difference in turn depends on the location of the sender, ...

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Where does metadata go when you save a file?
11 votes

It generally differs from filesystem to filesystem where the metadata is stored. On the ext2-family of filesystems, the metadata you mentioned (owner, group, permissions, time) are stored in the inode....

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How to tell which SATA controller a drive is using?
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8 votes

The device hierarchy is available in /sys, if you don't want to do it manually, you can use udevadm: $ udevadm info -q path -n /dev/sda /devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/...

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why am i seeing other computer's traffic on wireshark?
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8 votes

These are multicast packets, in particular Simple Service Discovery Protocol (SSDP) and Multicast Domain Name Service (MDNS) packets that are used for configurationless discovery in one single LAN or ...

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Why you can't just "dd" CD Audio like an ordinary data CD?
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7 votes

Audio CDs (also called CD-DA, specified in the proprietary Red Book) are the oldest format of the CD. The format is inspired by the audio record, so you have a spiral track with continuous data, and ...

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How to understand lspci tree format?
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7 votes

Why the tree output shows that all the devices connect to the same PCI bus(bus 00)? Because that's how PCIe structure works: All devices are connected to a single root node. (Though you can have ...

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Understanding the output of the 'iw reg get' command
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7 votes

Interesting question, and I didn't know the answer, so here is how I found out: The source code for 3.17 shows where the data comes from. In particular, The first group (5250 - 5330 @ 80) is the ...

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How to create a virtual LAN on Linux with dummy interfaces and bridges?
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7 votes

Dummy interfaces are called "dummy" because they don't actually work. Their only usage (I know of) is to allow a long-lived application to bind on them, so you can move them around and bridge them to ...

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What do input and output chains in NAT table do?
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7 votes

INPUT and OUTPUT chains are traversed for packets delivered to and sent from applications running on the local machine. If an application sends out a packet, it traverses app -> OUTPUT -> ...

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Linux bridge network influenced by route table
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7 votes

Bridging doesn't work the way you think it works. :-) A bridge is only concerned with OSI level 2 (Ethernet frames). On this level, IP addresses etc. don't exist. Conceptually, you can think of a ...

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A wifi AP with a single NIC
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7 votes

In case anyone comes here to identify "STA/AP BI must match": The kernel source in include/net/cfg80211.h, in particular struct ieee80211_iface_combination, says * @beacon_int_infra_match: In this ...

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Can you connect a USB3.0 hard drive to an eSata port?
6 votes

SATA port and USB port use completely different protocols, and you can't connect one to the other. However, nearly all USB harddrives are really SATA drives in an enclosure that has an USB-to-SATA ...

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Forward DNS request to my work's jump server
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6 votes

Partial answer: You can't selectively forward DNS requests for specific hosts in general (like Foxyproxy can handle specific requests for specific hosts or paths). The only thing you can do is to ...

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No one in the internet explains how to change the sys folder on ubuntu
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6 votes

What you have in sys are "files" that really point to kernel parameters used by various modules. So it's the loaded kernel modules which determine what you see under sys. It doesn't make sense to ...

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Grep causes entire system to freeze while comparing two files
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6 votes

The reason was definitely it ran out of memory. Because you are not "comparing two files", you are using one 250MB file as a source of patterns for grep. Grep compiles those patterns into a variant of ...

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Use a single Ethernet cable to connect multiple devices
6 votes

Just put a cheap ethernet switch in your living room, connect more cables to it, and connect as many other devices or more switches to the cables as you want. The signal won't be "mixed", because ...

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Convert a Kindle book to PDF
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6 votes

The .sdr file is the "sidecard" folder which contains files that have additional information: An .azw3f file contains metadata (e.g. author, number of pages) for a corresponding .azw file. The ....

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Can I connect USB-C display's USB hub to a PC via USB 3.0 to female USB-C adapter?
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6 votes

The manual of the DELL S2718D says on p. 9 1x USB Type C (Alternate mode with DP1.2, USB 3.1 upstream port, Power Delivery PD up to 45W) So it's not only a USB-C type port, it also needs ...

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Transparent tunnel between interfaces on remote hosts
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6 votes

I haven't tried this myself, but I know you can use gretap to tunnel layer 2 (ethernet) over layer 3 (ip). According e.g. to this blogentry, you set up one gretap interface at each end and bridge it ...

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Can a VGA monitor be used with a DVI/HDMI graphics card?
6 votes

If you look at the Wikipedia article for DVI, especially the pinout, you'll see that DVI also can carry analog signals (the variant called "DVI-A"). That's why DVI to VGA adapters work: They take the ...

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