If This Can’t Help You With Free USB Data Recovery, Nothing Will. What Is USB. As the abbreviation of Universal Serial Bus, USB is an external bus standard, used for the specification of connection and communication between computer and external device.
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At the end of 1. 99. USB was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies. USB version has gone through years of development since its first release – V0. November 1. 1, 1. Now, USB becomes a standard PC expansion interface of the twenty- first century and the 3. Yet, USB1. 1 and USB2.
USB adopts a 4- pin plug (USB3. In this way, it can be connected to up to 1. USB requires the support of host hardware, operating system and peripheral to work properly. USB interface can also achieve two- computer interconnection via a dedicated USB bridge cable and create more additional interfaces through Hub. USB has the features of fast transmission speed, convenient usage, hot swappable, flexible connection, independent power supply, etc. It plays an important role in connecting computer with almost all external devices, such as mouse, keyboard, printer, scanner, camera, charger, USB Flash Drive, MP3, cell phone, digital camera, mobile hard disk, external optical floppy, USB card, ADSL Modem and Cable Modem. Structure Parsing of USB.
USB system manages the data transmission between host and USB devices through a host controller. Meanwhile, USB system is also responsible for managing the USB resources, such as bandwidth and bus energy. This enables customers to access USB successfully. The analysis of USB structure can be divided into mainly two aspects: software structure and hardware structure. Now, we’ll talk about them respectively. Software structure: each USB only have one host and the host software is designed on the basis of modular and object- oriented method. USB software generally consists of three main modules: Universal Host Controller Driver (UHCD), USB Driver (USBD) and USB Client Software.
Hardware structure: USB uses four- wire cable. Two of them are the serial channels used to transfer data; the other two are used to provide power for downstream device. For the high- speed peripherals which need high- bandwidth, the USB data transfer rate could reach 1. Mbps. Yet for the low- speed peripherals, USB would transfer data only at the speed of 1. Mbps. In a word, USB bus will switch between those two modes dynamically and automatically according to peripheral. USB system adopts the cascaded star topology, which consists of three basic components: host, Hub and function equipment.
Host, also known as the root, root knot or root Hub, is installed into a computer by mounting on the motherboard or using as an adapter card. Containing host controller and root hub, the host controls the flow of control information and data on the USB bus.
Hub is a specific component of USB structure; it provides the point named port and makes the device connected to the USB bus. Meanwhile, it detects all devices connected to the bus and provides power management for them. What’s more, it is responsible for the fault detection and recovery of bus. The function equipment is connected to bus through port, and USB can also be used as hub.
Applications of USB in Daily Life. USB has been using in all walks of life around the work. And USB data storage forms the major part of USB applications. In view of this, methods for safely achieving free USB data recovery are urgently needed by those who lost important files/folders from a USB data storage device.
USB data storage devices: USB external hard drive, USB flash drive, USB mobile phone SD card, TF card, USB memory stick, etc. We bet those USB data storage devices are very familiar to users. Though the capacity of them is often much smaller than that of computer hard disk, they are prevalent throughout the world due to its convenience. The USB specification was jointly developed by Intel, NEC, Compaq, DEC, IBM, Microsoft and Northern Telecom. The transfer rate of USB1.
Mbps, but a USB device can only reach up to 6. Mbps transmission bandwidth. USB2. 0 is compatible with USB1. USB2. 0 device can only work at full speed (1. Mbit/s). The high speed and low speed of USB2.
Mbit/s and 1. 5. Mbit/s. USB 3. 0 – also considered as Super.
Speed USB – provides a standard interface for a variety of devices which are connected to PC or audio/high- frequency device. Of course, USB3. 0 is compatible with USB2. USB computer case interface: in both the front and back side of computer case, there exist several USB interface to help to connect external device, such as mobile hard drive, flash drive and digital camera, to computer. In this way, data in external device can be managed on computer conveniently. Wireless USB technology: Jeff Ravencraft, chairman of the USB Implementers’ Forum and chief technology strategy officer of Intel, said that wireless USB technology is going to help users get rid of complicated cable connections when they need to connect external devices to computer. The standard data transfer rate of wireless USB devices is the same with that of wired USB 2. M/s) founded in the twenties of the twenty- first century.
The difference lies in: wireless USB technology requires a wireless transceiver to be equipped in computer and external device (to replace cable connection). Wireless consortium specification defines two methods to establish a connection.
One is: using cable to connect computer and external device before wireless connection establishment. The other is: inputting the string of numbers provided by external device to computer in order to create connection. Specific USB application: those 5 applications of USB may be not unfamiliar to you: USB modem, USB loudspeaker box, USB Hub, USB sound card and USB computer camera. However, connecting two computers with the help of USB may be new to lots of users.
There are three main ways for us to transmit data between two computers. The first way is using network card; install network card to those two computers respectively and then modify the computer network settings. The second way is using the parallel port LL3 connecting cable to connect two computers; transmit data by making use of direct cable link program. The third way is the latest USB interconnection.
Protect USB Storage Devices, Try to Avoid Free USB Data Recovery. If important data are saved to a certain USB storage device, the strict management and control of this device becomes extraordinarily significant.
We have to try our best to prevent serious data loss or leakage event. We summarized the following 5 methods to help users avoid data loss as much as possible, so they won’t be bothered by seeking solutions for USB data recovery. Set write permission: in order to prohibit others to freely modify important data stored in the USB device, we can modify the relevant key value of system registry. In this way, ordinary users are only allowed to access data in USB device, not able to change them. Control virus running: considering that the USB device being infected by virus is a widespread situation, we recommend users take actions to try to control the automatic running of virus and Trojans in USB device (reject the access right of all accounts to USB device). Otherwise, after the USB device was connected to computer, the virus and Trojans will be activated automatically so as to damage data.
Hide the device drive: if you don’t want others to see the data in any USB devices, you may as well try to hide all the drives except for local hard disk drives. Thus, even though someone connects the USB hard drive to computer without your permission, trying to access your data, they’ll end up in seeing nothing in computer. Disable auto play: when a USB device is connected to the local computer, Windows system will automatically open the corresponding device window, in order to help users quickly access their files. Well, network virus is easy to take advantage of this process to damage data. Set a password: if you think it’s too troublesome for yourself to access data in a hidden USB device, you can choose to set an access password to the device, instead of hiding it completely. Though above five methods can help users greatly avoid data damage and data leakage, it’s crucial to be aware of the fact that data loss still happens frequently to USB device users. Any improper operations could lead to users losing significant data and then suffering from great losses.
Common Problems You May Meet in USB Storage Device. Once valuable data are lost, users will definitely try every means to recover data from USB device. So for users’ sake, we summarized four common problems users may meet during using USB data storage devices. After knowing this, users will be able to decrease the possibility of getting stuck in devastating data loss cases. Unable to safely remove a USB device: some users may have encountered the situation that when they plan to remove the USB device from computer, they find it can not be safely removed.
Windows prompts it fails to stop the device; users are asked to close all possible programs that may be using the device and then try again later. At this time, users should follow three steps to achieve safe removal. Firstly, please check whether there is any data copying/transfer in progress or not. Secondly, users need to confirm no program in Windows is using any files from the USB device to be removed (for instance, a video may be played in a Windows player, so users need to close them all). Thirdly, if the USB data storage device still can’t be removed after all programs were closed, users need to open Task Manager and then close all unnecessary background applications. If this still couldn’t help, users may as well try to close explorer. Please remember, don’t try to forcibly remove the USB device from computer in unsafe mode since it is easy to cause data loss.