To recover these lost files, PhotoRec first tries to find the data block (or cluster) size. This means the data is still present on the file system, but only until some or all of it is overwritten by new file data. When a file is deleted, the meta-information about this file (file name, date/time, size, location of the first data block/cluster, etc.) is lost for example, in an ext3/ext4 file system, the names of deleted files are still present, but the location of the first data block is removed. The seek time of mechanical drives is significant for writing and reading data to/from a hard disk, so that's why it's important to keep the fragmentation to a minimum level. In general, most operating systems try to store the data in a contiguous way so as to minimize data fragmentation. The cluster or block size remains at a constant number of sectors after being initialized during the formatting of the file system. Want to know if PhotoRec can recover your files ? Upload a sample file via the PhotoRec online checker (BETA).įAT, NTFS, ext2/ext3/ext4 file systems store files in data blocks (also called clusters under Windows). The whole list of file formats recovered by PhotoRec contains more than 480 file extensions (about 300 file families). PhotoRec recognizes and recovers numerous file formats including ZIP, Office, PDF, HTML, JPEG and various graphics file formats. If there is no data fragmentation, which is often the case, it can recover the whole file. PhotoRec searches for known file headers.
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