Make Your Move To Recover CD/DVD Disk At Once
- Data Loss Cases on CD/DVD
- Basic Knowledge of Compact Disk
- Reading Technology of Compact Disk
- Hurry to Recover CD/DVD Disk with a Powerful Tool
- Related Articles
- User Comments
Yet, this doesn’t mean CD or DVD is totally out of date. On the contrary, many users still prefer to use CD/DVD for data storage, such as collecting favorite music tracks. In addition, to meet users’ demands for using CD/DVD to read and save data, manufacturers have released movable optical disk drive. Thus, users can connect the movable drive to computer (desktop or laptop) and then insert CD/DVD into it for data accessing and managing.
Well, just like any other storage devices, CD/DVD disk is also not an absolute safe place for data saving. Even worse, we have to admit that CD/DVD disk is relatively more vulnerable than other devices. However, there’s also good news – it’s possible and definitely not difficult for even inexperienced people to recover CD/DVD disk after they found CD/DVD was damaged and important data were lost.
Data Loss Cases on CD/DVDHave you found yourself stuck in any of those situations? Of course, we hope you would never come across any of them.
1.You concentrated on burning a CD or DVD, but only to find some of the files here appear to be inaccessible or lost when you finally finish this process.
2.When you plan to make some changes on (manage or update) data saved in a CD/DVD, you cause vital file loss because of improper operations like pressing the wrong button. Of course, this will not happen if the disk you’re running is a CD-R or DVD-R.
3.While you’re in the middle of something, such as modifying file content and location, you’ll fall into big trouble if power went out suddenly without giving a sign.
4.After adding new data into your CD or DVD, you disappointedly discover that some old files saved there before are now missing.
5.If virus is hidden in the files you prepare to transfer to CD/DVD, both the old files and newly added files are in danger of being deleted/damaged.
6.Even if you have done nothing wrong to the CD/DVD disk, data could be lost there. This often appears due to the not uncommon reason – physical damage, such as scratch, stain, a short circuit and component deformation.
When those situations really take place, we know, all of you would try your best to retrieve the lost files as long as they are not useless. But no matter you need to recover files from CD or from DVD, what you should remember is not to perform any operations again to the target disk, in order to avoid data overwriting and permanent data loss.
Tips: if the serious data loss is unfortunately caused by hardware failures, you have no choice but to pay much money for hiring professionals to repair & recover data from damaged CDs or DVDs. But no one can ensure you that the lost data could be recovered 100%; that really depends on how the data are lost and how serious the disk is damaged.
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Basic Knowledge of Compact DiskBefore telling users how to recover files from CD or how to recover DVD files for free, we feel it’s essential to firstly focus on compact disk itself. Then, we’ll naturally change our topic to CD data recovery and DVD data recovery to make a simple analysis of them.
Compact disk, also known as optical disk, is a disk which uses optical information as the storage carrier to save data for us. It is roughly divided into two categories according to the data writing mode: rewritable disk and non-rewritable disk. Compact disk can be used to read and write data thanks to the laser principle.
According to the structure, compact disk is generally divided into several types, such as CD, DVD and blue-ray disc. Though these kinds of disks are different in structure, they share the same main structural principle. Well, there is no difference in the structure of rewritable CD and non-rewritable CD; they mainly differ in some manufacturing processes and the application of materials. As for DVD, the situation is almost the same.
Since compact disk like CD and DVD is more fragile when compared to other storage devices, such as USB flash drive and mobile hard disk, we strongly recommend all users be careful enough when using a CD/DVD, especially when moving them (inserting it into CD driver or taking it out from a box). Besides, users have to put CD/DVD disk in an appropriate environment when it is not in use: water-proof, dust-proof, proper humidity, applicable temperature range, and so on.
Keep this in mind: even a slight scratch or a tiny oil stain on compact disk surface is likely to cause data loss problem. In such cases, users have no choice but to recover CD/DVD disk on their own or by hiring professionals.
Reading Technology of Compact DiskThere are basically 3 kinds of reading technologies adopted by compact disk to read data. Now, we’re going to guide all of you through them.
- CLV (Constant Linear Velocity) technology: in order to maintain a constant data transmission rate, it will change the rotational speed of disk at any time. As a result, the rotational speed of disk while reading the data near center is much faster than that of disk while reading data written on the edge.
- CAV (Constant Angular Velocity) technology: it uses exactly the same speed to read data on the entire disk. On the same compact disk, the transmission speed of inner data is lower than that of outer data. Thus, while outer data are read, optical disk transmission speed can be well reflected.
- PCAV (Partial Constant Angular Velocity) technology: this is a new technology which integrates CLV and CAV. When reading data saved away from disk center, it uses CLV technology; while reading data saved near disk center, it uses CAV technology instead. In this way, the overall data transmission speed is improved.
Classification & Characteristics of CD/DVDAs we said, compact disk can be roughly divided into several categories, including CD and DVD. CD/DVD can be further divided into more types.
Common types of CD:
- CD-ROM (Compact Disc Read Only Memory): in 1988, Yellow Book Standard was released to define archive file format; it also defines MODE1 – used for computer data storage, and MODE2 – used for storing compressed videos and images. This makes CD become a universal storage medium. In addition, error detection code and correction code are added to ensure the correct and complete read of computer data.
- CD-R (Compact Disc Recordable): it is a standard which can be written once, but read permanently. Once data are written to the CD-R, it can never be rewritten. The CD-R that has already been written is able to be read on a CD-DA or CD-ROM drive. By the way, the working principle of CD-R is the same with that of CD-ROM.
- CD-RW (Compact Disc ReWritable): since it adopts phase-changed technology, CD-RW’s laser reflectivity is much lower than that of many other CDs. In the beginning of 1996, Ricoh, Philips, SONY, Yamaha, Hewlett-Packard (HP) and Mitsubishi Chemical Corporation established an industrial forum and released CD-RW format standard. Undeniably, CD-RW and CD-R share a same burning method, and the biggest different is whether the disc is a rewritable one or not.
- Photo-CD (Photo Compact Disc): in 1989, KODAK Company launched the Orange Book Standard for photo disc, which is able to store 100 high-resolution photos in five different formats.
Common types of DVD:
- DVD-RAM (Digital Versatile Disc Random Access Memory): it is made on the basis of Phase-changed Dual and partial MO technology. The capacity ranges from 2.58GB to 4.7GB. The first generation of DVD-RAM appeared in June 1998, and one year later, version 2.0 was launched. In 1999, Panasonic and Hitachi launched DVD-ROM to support DVD-RAM.
- DVD-R (Digital Versatile Disc Recordable): this is just like CD-R, which can only be burned once. As a matter of fact, a laundry list of DVD readers and players all give support for DVD-R. Its capacity is extended to 4.7GB from 3.95GB. The early DVD-R includes 2 types, which are respectively DVD-R(G) and DVD-R(A), while the latter is designed for professional market.
- DVD-RW (Digital Versatile Disc ReWritable): in December 1999, DVD-RW home video recorder was launched by Pioneer in Japan. Just like CD-RW, it can be rewritten over 1,000 times. DVD-RW adopts Track Pitch, Mark Length and Rotation Control, which is similar to DVD-R. With good compatibility, DVD-RW can be read by all DVDs of Pioneer, Sharp and Zenith. The formatting process of DVD-RW will take a little bit time.
- DVD-Video (Digital Versatile Disc Video): it is a DVD specification which has been mainly applied to consumer electronics field to read digital audio and video data.
- DVD-Audio (Digital Versatile Disc Audio): it is the DVD specification used to read digital music data; it is also mainly applied to consumer electronics filed, focusing on ultra-high-quality performance.
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Hurry to Recover CD/DVD Disk with a Powerful ToolIn general, CD and DVD are used to store personal/business data just like other devices. However, the biggest difference lies in that data on both CD and DVD can’t be deleted or formatted casually unless it is a CD-RW or DVD-RW.
If users are using a CD-ROM, it is impossible for them to add new data or perform any other operations to the disk, on which some data are burned by default. However, if users are running a CD-R, they can burn their favorite music tracks, photos or other things on the disk once, and then use it whenever they want afterwards. And users need to be aware of one thing: files saved on the CD-R couldn’t be modified. CD-R is a kind of write-once disk, so it is also not able to be formatted if users intend to clear all data saved there.
Nevertheless, if a CD-RW/DVD-RW is used, users can modify files and add new data to the disk according to needs. In addition, if the CD-RW or DVD-RW with important files & folders is formatted or erased by mistake, CD recovery/DVD recovery should be performed as soon as possible. That is because lost data could be gone for good once they are overwritten.
Considering that we found many users are seeking ways to recover deleted files from CD for free, we decide to introduce a piece of professional CD recovery software to help them with that. Please follow this guide to recover CD/DVD disk in person.
Firstly, download & install the free software to computer hard disk. Users can also buy a paid edition and then install it to computer. Look this to know differences among different editions.
Secondly, launch software and choose “CD/DVD Recovery” module, which is designed especially to help users recover lost data from formatted or erased CD/DVD. Then, select the CD (or DVD), which includes data waiting to be restored and press “Full Scan” to detect lost files.
Thirdly, choose photos, audios, videos or any other kinds of data users need from CD and press “Save” to store them out to another disk, such as internal hard disk and USB flash drive.