Before starting recovery..
..but not the least. Checking a data storage connection before starting recovery.
Regardless of the logical structure of a storage, the data is still stored on a physical device. During the process of data recovery, a data recovery program works with a physical device a lot. A good piece of advice before starting retrieval of lost files is to make sure that the physical medium is connected properly.
Internally connected hard drives
If the operating system doesn’t display your disk in the Windows Disk Manager, neither will data recovery software. You need to check if this disk is attached properly to the computer: examine the data connector and the power supply cable, (whether they are connected firmly to the hard drive and have no breaks). Yet, if everything seems to be in place except for the disk, your drive can have physical damages and you should turn to a data recovery center to physically repair the disk.
Externally attached hard drives
Whereas hard disk drives attached externally via an ordinary USB cable are unlikely to cause you any problem (yet with an intact cable, good connection and all necessary system drivers), disk drives attached via a SATA/USB adapter may still remain questionable especially for disks of above 2 TB (2.5, 3, 4, 6 TB an so on).
The adapter may be incapable of transferring data addressed with big numbers because of its data transmission capacity. In order to access data on large disks, the adapter needs to indicate big numbers for data addresses. Old adapters are unable to work with such big numbers. For this reason, disk sizes of big disks, connected via old adapters, displayed in Raise Data Recovery can differ from the real ones. The same problem may also arise for internal drives in case of a poor economy design or an older motherboard.
USB flash drives
USB flash drives are very simple to connect to a computer by inserting into a USB port. If a USB flash drive is not detected by the operating system, one of the problems may be that the operating system doesn’t have necessary drivers for some reason. The system will ask you for drivers, which can be freely downloaded from the retailer web site.
Another reason for an undetectable USB flash drive may be a broken USB port. In this case, the system will neither show you any messages nor react to your inserting the drive or will detect it as "Unknown device". Please try a neighboring USB slot in order to define the problem. If the system still doesn’t detect the flash drive, the reason may be the flash drive itself. In such case, you need to bring the drive to a data recovery center to get access to your data.
To connect a memory card to your computer you need a card reader being unimpaired, with intact cable (if applicable) and good condition of slots for connection of a memory card. If a system doesn’t show your memory card, the problem may also be in the USB port itself. Try another one you can find on the front or back panel of your computer.
Network Attached Storage
Network Attached Storage is a stand-alone data storing and sharing device which needs a local area network to establish communication with your computer and a special software to access it over the network. Obviously, such software does not include data recovery utilities. For this reason starting data recovery from a NAS you need to take all NAS disks out of the box and connect NAS disks to a computer for recovery.