Most SD cards ship preformatted with one or more MBR partitions, where the first or only partition contains a file system. This lets them operate like the hard disk of a personal computer. Like other types of flash memory card, an SD card of any SD family is a block-addressable storage device, in which the host device can read or write fixed-size blocks by specifying their block number. Under Windows, SD cards can be formatted using NTFS and, on later versions, exFAT. Under macOS, SD cards can be partitioned as GUID devices and formatted with either HFS Plus or APFS file systems or still use exFAT. Under Unix-like operating systems such as Linux or FreeBSD, SD cards can be formatted using the UFS, Ext2, Ext3, Ext4, btrfs, HFS Plus, ReiserFS or F2FS file system.
Reformatting is a high-level formatting performed on a functioning disk drive to free the medium of its contents. Reformatting is unique to each operating system because what actually is done to existing data varies by OS. The most important aspect of the process is that it frees disk space for use by other data. To actually “erase” everything requires overwriting each block of data on the medium; something that is not done by many high-level formatting utilities. Reformatting often carries the implication that the operating system and all other software will be reinstalled after the format is complete. Rather than fixing an installation suffering from malfunction or security compromise, it is sometimes judged easier to simply reformat everything and start from scratch.
Reformatting an SD card with a different file system, or even with the same one, may make the card slower, or shorten its lifespan. Some cards use wear leveling, in which frequently modified blocks are mapped to different portions of memory at different times, and some wear-leveling algorithms are designed for the access patterns typical of FAT12, FAT16 or FAT32. A malfunctioning SD card can be repaired using specialized equipment, as long as the middle part, containing the flash storage, is not physically damaged. The controller can in this way be circumvented.
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Unformat: Recover data from formatted SD Card – Bplan data recovery software is the fastest way to scan and recover data. Bplan can help you find lost data such as videos (AVI, MP4, MKV, WMV, MPG, 3GP, 3G2, SWF, FLV, TOD, AVCHD, MOV, DV, RM, QT, TS, MTS) photos (learn photo recovery, JPG, NEF, CR2, X3F, SR2, PNG) after you have accidentally deleted or reformatted SD card.
Sometimes, data present in the sd card gets lost, deleted and formatted due to circumstances like virus attack, accidental deletion or accidental use of SHIFT+DELETE. In these cases, data recovery software are used to recover/restore the data files.
Sometimes data can be recovered using relatively simple methods and tools; more serious cases can require expert intervention, particularly if parts of files are irrecoverable. Data carving is the recovery of parts of damaged files using knowledge of their structure.