A method executed by a storage device including a plurality of disks, the method comprising: dividing the plurality of disks into a plurality of journal areas and a plurality of data areas, respectively; when a write command for target disks among the plurality of disks is received, performing a first write operation to store target data to be written into journal areas of the target disks, the target disks being included in a same array; and after the first write operation is completed, performing a second write operation to store the target data into data areas of the target disks, wherein: performing the first write operation includes: receiving first data from a host; storing first data included in the target data into a first data block included in a first disk among the target disks, the first data block having a first physical block address; and mapping a first logical block address indicating a journal area of the first disk with the first physical block address, and performing the second write operation includes: receiving the first data from the host; storing the first data into a second data block included in the first disk, the second data block having a second physical block address; and mapping a second logical block address indicating a data area of the first disk with the second physical block address. dividing the plurality of disks into a plurality of journal areas and a plurality of data areas, respectively; when a write command for target disks among the plurality of disks is received, performing a first write operation to store target data to be written into journal areas of the target disks, the target disks being included in a same array; and after the first write operation is completed, performing a second write operation to store the target data into data areas of the target disks, wherein: performing the first write operation includes: receiving first data from a host; storing first data included in the target data into a first data block included in a first disk among the target disks, the first data block having a first physical block address; and mapping a first logical block address indicating a journal area of the first disk with the first physical block address, and performing the second write operation includes: receiving the first data from the host; storing the first data into a second data block included in the first disk, the second data block having a second physical block address; and mapping a second logical block address indicating a data area of the first disk with the second physical block address. performing the first write operation includes: receiving first data from a host; storing first data included in the target data into a first data block included in a first disk among the target disks, the first data block having a first physical block address; and mapping a first logical block address indicating a journal area of the first disk with the first physical block address, and receiving first data from a host; storing first data included in the target data into a first data block included in a first disk among the target disks, the first data block having a first physical block address; and mapping a first logical block address indicating a journal area of the first disk with the first physical block address, and performing the second write operation includes: receiving the first data from the host; storing the first data into a second data block included in the first disk, the second data block having a second physical block address; and mapping a second logical block address indicating a data area of the first disk with the second physical block address. receiving the first data from the host; storing the first data into a second data block included in the first disk, the second data block having a second physical block address; and mapping a second logical block address indicating a data area of the first disk with the second physical block address.