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Different types of failures and devices

There are different types of devices for temporary or permanent data storage. They have different capacities and can be classefied as optical, magnetic and memory (data is stored in so-called flash memory). In most cases it is possible to save data even if it is a case of major physical damages.

Data can be recovered from devices such as:

Hard Disk Raid sistemi Opticki uredjaji
Hard Disk
RAID Optical media
(CD, DVD, BlueRay)
USB FLash Memorijske kartice Floppy diskovi
USB Flash Memory Cards Floppy, Jazz, tapes and other

Hard Disk

Hard Disk (Hard Drive) is one of the computer devices that is used for operative system storage and user data storage. Their capacities are now moving up to several terabytes(TB). Magnetic boards (plates that store data) and magnetic heads (moving heads that read data from magnetic boards) are some of the hard drives main parts along with motors and digital circuits.

Hard disk consists of more magnetic plates, each with it own head to read data. Also data is almost never placed continuously but it can be recovered from several areas on the magnetic board called sectors. The data organization on each drive depends on the type of so-called file system that is used. Windows operative systems use FAT and NTFS file systems, while Linux operative systems are using Ext2, Ext3, Swap and other file systems. EWE Comp is able to repair all types of discs: SATA, IDE, SCSI.

Slika Hard diska

There are several types of hard disk failures:


Thanks to the file system table, the binary recording on the magnetic board is mapped and it shows the locations of each file. Each partition has it own file system and a special block on the disk exists and shows the area which is occupied by each file. The problem may occur when the file system table is lost. In that case computer is not able to list the locations of the files, so they are actually ’’spilled’’ on disk but still existing. Because of this failure the operative system is not working and our job is to locate the data and recover it.

Engine failure

Damaged engine is one of the most complex hard drive failures. It is located under the very hard drive plate and its replacement requires removal of the plates, replacement of the head and eventually replace of the whole engine.
This operation requires the use of special tools that enable the same position of panels, and represents the worst kind of intervention in the process of data recovery.


Mechanically damaged hard drive usually can be identified by a particular sound that comes out of the case of the hard disk (palpitations).
This type of failure can cause physical damage to the media, which results in permanent loss of data.
You are advised to react immediately as soon as you notice this by turning off the hard drive in order to avoid greater damage to the media.


As hard drive requires a specific electronic components to work properly the failure may appear here. This offten happens when a hard drive gets into a contact with a charged object or due to a low voltage in the business/residental building in the moment of transferring it from a computer. The most usual indicator is a disk immobility or more precisely, the magnetic plates are not moving.

Bad Sector

The box where the hard driveis located is designed to prevent the penetration of a certain strenght of the magnetic fields. A problem may appear in case the hard drive is exposed to a greater magnetic force. It is when so-called ’’bad’’ sectors shows up and these are the sectors that can not be read by disk.

Service area damage (Firmware)

Each hard drive model has a digital circuit that performs logical operations to convey information from the magnetic plates into suitable format to be read by other computer parts. EWE Comp is able to recover data even in that case. Working together with CSSI, as our support in the worst cases, and in their modern equiped laboratories we can simulate the Firmware.


  • Do not try to repair your hard drive by yourself, because you are risking to create even grater damage and to lose your data forever.
  • Do not attempt to restart the device.



RAID (Redundant Array of Independent Disk)

RAID systems are the systems of hard drives connected into series. RAID is used in order to get a higher speed and a greater stability of data. If you have designed RAID properly you will not be in the situation to lose your data. RAID records the data simultaneously to multiple drives in a row (RAID 0) creating a real-time backup, so in the case of failure of one hard drive the data will be stored the other ones. RAID is also used to make one logical drive of multiple physical disks but it is not recommendable. So, there are several levels of RAID and we can recover data from:

  • RAID 0
  • RAID 1
  • RAID 1E
  • RAID 0+1
  • RAID 2
  • RAID 3
  • RAID 4
  • RAID 5
  • RAID 5E
  • RAID 5EE
  • RAID 10
  • RAID 50
  • RAID 51

Working with RAID systems is a very sophisticated and responsible work as RAID systems are used by banks, government institutions and large heavy-duty servers. We are working with all types of RAID hard drives and we are able to recover the data in all the cases, wheather it is physical damage, mechanical malfunction, electrical failure or a system crash.

Optical media
Compact Disk

Optical devices are computer devices that serve to read optical media. They can be CD, DVD, BlueRay, HD DVD readers. CD or DVD drive is a device that transpone stored data on compact disc into electrical signals. Reading of the information is provided by a red or a green laser beam targeting the surface of the disk and detecting the intensity of reflection, which depends on the existence of the pit (pit) and surface (land) on the reflective layer of disc. The light reflected from the pit has a much weaker intensity compared to the light reflected from a surface. The surface and the pit reflected light is trensmited through a complex system of lenses and mirrors to the photo diode or CCD which can detect differences in the light intensity and than transfer them into electrical signals (one and zero). These impulses are decoded by the controller logic of the device in the form of digital data and than sent to the computer motherboard via an interface. The most common problem with optical media is the case when the area with recorded data is scratched. Than the laser beams are not reflecting properly and it is not possible to read the data.

USB flash and memory cards
Compact Disk

USB Flash Drives are small and suitable for transfering data but today it is not possible to imagine working on multiple computers without this device. USB stick has so-called flash memory which is becoming larger and larger with every new model. In addition to many virtues of these memory devices there are also disadventages such as sensitivity to electrostatic discharge, limited number of data recording and more. Clients usually delete data from their flash memory and we are successfully finding and return it to them. When it comes to memory card the story is similar. Memory cards are commonly used on devices such as cameras, camcorders, mobile phones and PDAs. Our lab is able to recover data from all types of memory cards.

  • CF-I
  • CF-II
  • SM / SMC
  • MS
  • MSD
  • MSPD
  • MSPDx
  • M2
  • MMC
  • RS-MMC
  • MMCmicro
  • SD
  • SxS
  • UFS
  • MiniSD
  • MicroSD
  • xD
  • iStick
  • SFM
  • µcard
  • NT NT+

Floppy disks, tapes and other...
Compact Disk

Nowdays you can rarely see a data transfered in this way. Floppy disks have been used to transfer documents, to boot and for other administrative tasks. Emergance of USB flash drive and possibility to boot them made the floppy disk unusable. We must note that it is possible to recover data from a damaged floppy disk if you need it. We can also easily restore data from an old disk, wheather it is 5.25’’ or 3.5’’ strip. It is possible to record even the data from your old computer tapes.



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