USB flash drives, used as data storage devices, include flash memory with an integrated USB (Universal Serial Bus) interface. They are typically much smaller than a floppy disk and are removable & rewritable. They are often used for the same purposes for which CD-ROMS or floppy drives were used but have thousands of times more capacity, and are more reliable and durable than the latter ones, because they have no moving parts. Due to these features of USB drives, floppy drives have been abandoned in favor of USB ports. Most USB drives are preformatted with FAT12, FAT16 or FAT32 file systems, but as they appear as USB-connected hard drives, they can be reformatted to the file system supported by the host operating system.

Most USB flash drives no longer include a write-protect mechanism which makes a device suitable for repairing virus-contaminated host computers, thus leading to risk of infecting the USB flash drive itself. This can lead to important data loss in USB drives; however, you can perform Mac recovery from USB drives using a good recovery tool for Mac systems. Some of the USB data loss scenarios are mentioned below:

• Accidental deletion: Sometimes, you accidentally delete your data on USB drives, but deleted data from USB drives does not get stored in Mac trash.
• Virus attack: As USB drives can be used on almost all the computers, they are more prone to virus attack, which can make the data inaccessible on USB drives.
• Input and Output errors: Data can be lost due to I/O errors which can be shown up because of some problems with logical part of your hard drive or may due to physical errors with the hard disk. In case of logical problem, you can use Disk utility to recover data which does not guarantee the complete recovery. However, you can use an effective recovery tool in case of data loss in Macintosh due to input and output errors.
• Unplugging USB drive without mounting: When you unplug a USB drive without mounting it- a common mistake made by many of us, drive could get corrupted and corrupted drive could cost us the data stored on it.
• Journal corruption: Both HFS+ and HFSX file systems make use of the journaling system to deal with the data loss issue. But in some circumstances, journal file itself gets corrupted, due to which the file points to wrong locations; thus making the data inaccessible. To overcome the data loss due to journal file corruption in Mac, users can try a good Mac recovery tool.
• Finder error: Finder is an essential part of Mac operating systems; it is responsible for proper launching of applications and management of files on drives. In some occasions, Finder stops working and displays an error message such as “Error Code-36″. This makes the USB drives connected inaccessible, resulting in loss of vital data. However, software to recover data after Finder error in Mac can be used.

In such data loss scenarios, you can use an efficient Mac recovery utility to perform Mac OS X data recovery from emptied trash, from hard drives such as SATA, SCSI, IDE, etc and flash drives such as SD card, XD card, MMC card, CF card, etc., which supports HFS+ and HFSX file systems for Mac OS X 10.5 and above operating systems. This software can be also be used for recovering Mac data from deleted partition.

Steps to recover data lost from USB drives:

Step 1: Download and install the trial version of the software on the Mac volume, and launch it from the Application folder or by double-clicking the shortcut icon of the software. Main screen will appear where you have to select “Recover Volumes/Drives” option. When next screen appears, as shown in Fig., select “Volume Recovery” option to recover lost or inaccessible data from USB drives.

Step 2: Next screen will display the list of Mac volumes and connected USB drives, as shown in Fig., select the volume from which data has to be retrieved and click “Next“.

Step 3: The software will start scanning the volume to recover lost data, as shown in Fig.

Step 4: Once the scanning process is completed, the recovered data is displayed in the list, which can be viewed as “Data view” or “File Type view“, as shown in Fig. If you are satisfied with the recovered results, you can purchase the full version and save the recovered data.

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