If This Can’t Help You With Free USB Data Recovery, Nothing Will
- What Is USB
- Structure Parsing of USB
- Applications of USB in Daily Life
- Protect USB Storage Devices, Try to Avoid Free USB Data Recovery
- Common Problems You May Meet in USB Storage Device
- How to Recover Data from USB Device
- Related Articles
- Users Comments
What Is USBAs 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. At the end of 1994, USB was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies. USB version has gone through years of development since its first release – V0.7 was issued in November 11, 1994. Now, USB becomes a standard PC expansion interface of the twenty-first century and the 3.1 version is out. Yet, USB1.1 and USB2.0 is mainly used in current motherboard.
USB adopts a 4-pin plug (USB3.0 standard is 9 pin), as a standard plug, and daisy-chain to connect all the peripherals. In this way, it can be connected to up to 127 external devices with no loss of bandwidth. 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 USBUSB 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 12Mbps. Yet for the low-speed peripherals, USB would transfer data only at the speed of 1.5Mbps. 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 LifeUSB 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.
1.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 USB1.1 standard interface is 12Mbps, but a USB device can only reach up to 6Mbps transmission bandwidth. USB2.0 is compatible with USB1.1, but in this case, USB2.0 device can only work at full speed (12Mbit/s). The high speed and low speed of USB2.0 device are respectively 480Mbit/s and 1.5Mbit/s. USB 3.0 – also considered as SuperSpeed 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 USB2.0.
2.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.
3.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 2.0 standard (480M/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.
4.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 RecoveryIf 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.
1.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.
2.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.
3.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.
4.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.
5.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 DeviceOnce 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.exe process for the moment.)
Please remember, don’t try to forcibly remove the USB device from computer in unsafe mode since it is easy to cause data loss.
- USB device can’t be recognized: users connected their USB device to computer, but nothing shows up in computer; this is what we called the device couldn’t be recognized. And those five reasons could lead to this – USB data line problem, USB interface voltage instability, compatibility issue, BIOS setting problem and drive hidden issue. Here is our advice for such phenomenon:
1.Connect the USB data line to another computer to check whether it is broken.
2.Check whether the USB interface voltage is adequate or not.
3.Check whether the motherboard and system are compatible with each other.
4.Make sure the USB is enabled in BIOS and operating system.
5.Try to unhide the drive with Disk Management or third-party tool.
- Unable to access USB device (prompt says it needs formatting): how upset users will be when they fail to enter the USB storage device after connecting it to computer. In this case, users are not able to see any data saved in that USB device. And the system prompt may appear, suggesting them to format the drive for further use.
This could appear when users’ USB device is attacked by virus. Besides, if users format the drive by accident, the situation is very similar. All users stuck in those two situations can make use of the “Damaged Partition Recovery” function in MiniTool Power Data Recovery to get back data in inaccessible USB device.
- Delete data by accident: undoubtedly, everyone makes mistakes in life and work. And the situation is the same when it comes to data storage and management in USB device. Lots of users said they have deleted useful files from USB device unintentionally and they all feel very chagrin after realizing the mistake. This is a common case and we can assure that users’ deleted data can be easily recovered by using “Undelete Recovery” function of MiniTool Power Data Recovery. (If users’ data in USB device are lost due to virus invasion, they can still adopt this method to recover lost data as long as the device can be accessed as usual.)
All in all, once USB device can’t be accessed or valuable data in it are missing, the first thing users would like to and should do is definitely recover data from USB device. Since not every user is able to afford the charge for data recovery, most of the users choose to seek for solutions to achieving free USB data recovery.
How to Recover Data from USB DeviceWe advise all users (experienced users or green hands) to rely on MiniTool Power Data Recovery – the greatest free data recovery software – to easily and safely get back lost data from USB device.
7 reasons for users to choose MiniTool Power Data Recovery:
1.It is totally free, safe and harmless.
2.The size of it is small and the software installation has basically no requirement for hardware.
3.Five functional modules are embedded in it to help users get rid of almost all data loss problems (as long as the lost data are not overwritten by the newly saved information).
4.This free data recovery software is formed by wizard-style interfaces. Users don’t need to worry about anything since they can complete recovery work independently under guidance.
5.It has strong scan intensity, fast scan speed and automatic data protection feature.
6.It can work perfectly in various operating systems and is able to recover data from almost all commonly seen storage devices: USB flash drive, memory card, CD, DVD, computer hard drive, etc.
7.Whether the free USB data recovery can be finished successfully or not, this software will definitely not damage users’ current data.
Why don’t you give it a shot if you’re troubled by data loss tragedy?