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An memory device including a data region storing a main data, a first index region storing a count data, and a second index region storing an inverted count data, where the data region, the first index region, and the second index region are included in one logical address.

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1. A nonvolatile memory device comprising: a data region storing a main data;a first index region storing a count data;a second index region storing an inverted count data; anda control unit that compares the count data to an inverse of the inverted count data and determines that the count data is v

1. A nonvolatile memory device comprising: a data region storing a main data;a first index region storing a count data;a second index region storing an inverted count data; anda control unit that compares the count data to an inverse of the inverted count data and determines that the count data is valid if the inverse of the inverted count data is equal to the count data,wherein the count data and the inverted count data are written to a location of the nonvolatile memory device corresponding to one logical address at a same time when a data operation is conducted on the main data. 2. The device of claim 1, further comprising: a memory block including at least one page, wherein the at least one page corresponds to the one logical address. 3. The device of claim 1, wherein the inverted count data is transformed through a predetermined transformation from the count data. 4. The device of claim 3, wherein the first index region is next to the data region. 5. The device of claim 4, wherein the second index region is next to the first index region. 6. The device of claim 5, wherein count data is the number of predetermined bits of the main data. 7. The device of claim 6, wherein the number of the predetermined bits is the number of bits having value of “1” or the number of bits having value of “0”. 8. A method of programming a data into a nonvolatile memory device, comprising: writing a main data into a data region into the nonvolatile memory device;writing a count data into a first index region;writing an inverted count data into a second index region; andcomparing the count data to an inverse of the inverted count data and determining that the count data is valid if the inverse of the inverted count data is equal to the count data,wherein the count data and the inverted count data are written to a location of the nonvolatile memory device corresponding to one logical address at a same time of the writing the main data. 9. The method of claim 8, wherein the one logical address corresponds to at least one page included a memory block. 10. The method of claim 8, wherein the first index region is next to the data region. 11. The method of claim 9, wherein the second index region is next to the first index region. 12. The method of claim 8, wherein the count data is the number of predetermined bits of the main data. 13. The method of claim 9, wherein the number of the predetermined bits is the number of bits having value of “1” or the number of bits having value of “0”. 14. The method of claim 8, the inverted count data is transformed through a predetermined transformation from the count data. 15. An apparatus for controlling a nonvolatile memory device, comprising: a control unit recording a main data, a count data and an inverted count data into at least one physical address into the nonvolatile memory device corresponding to a logical address,wherein the count data is the number of predetermined bits of the main data, and the inverted count data is transformed through a predetermined transformation from the count data, andwherein the control unit compares the count data to an inverse of the inverted data and determines that the count data is valid if an inverse of the inverted data is equal to the count data. 16. The apparatus of claim 15, wherein the control unit determines that the main data at the logical address is valid if the count data is valid and if the number of predetermined bits at the logical address is equal to the count data. 17. The apparatus of claim 15, wherein the number of the predetermined bits is the number of bits having value of “1” or the number of bits having value of “0”. 18. The apparatus of claim 15, wherein the main data is recorded in data region, the count data is recorded in first index region, and the inverted count data is recorded in second index region, wherein the data region, the first index region and the second index region are included in one logical address. 19. The apparatus of claim 18, wherein the first index region is next to the data region and the second index region is next to the first index region.