About OS boot in lba method

Here below are my code to boot OS from usb memory.I try using usb and my os basic is located at 0x004200(RAM).I am using int 0x13 ah=0x42 to load data from usb.My question is, wether It move the data to memory place of 0x008000?.My os is at 0x004200 as mention above, my os will load to 0x008000 + 0x004200 = 0x00c200.But when I do this , screen will refresh again and agin.How to solve the problem?

    ORG 0x7c00
            ;; BPB Structure                                                                                                                     
    JMP     entry           ;BS_jmpBoot                                                                                                  
    BS_OEMName      DB "HARIBOTE"
    BPB_BytsPerSec  DW 0x0200
    BPB_SecPerClus  DB 0x01
    BPB_RsvdSecCnt  DW 0x0020
    BPB_NumFATs     DB 0x02
    BPB_RootEntCnt  DW 0x0000
    BPB_TotSec16    DW 0x0000
    BPB_Media       DB 0xf8
    BPB_FATSz16     DW 0x0000
    BPB_SecPerTrk   DW 0x0001
    BPB_NumHeads    DW 0x0001
    BPB_HiDDSec     DD 0x00000000
    BPB_TotSec32    DD 0x00ee5000
    BPB_FATSz32     DD 0x00000020
    BPB_ExtFlags    DW 0x0000
    BPB_FSVer       DW 0x0000
    BPB_RootClus    DD 0x00000002
    BPB_FSInfo      DW 0x0001
    BPB_BkBootSec   DW 0x0006
            times   12      DB 0    ;BPB_Reserverd                                                                                               
    BS_DrvNum       DB 0x80
    BS_Reserved1    DB 0x00
    BS_BootSig      DB 0x29
    BS_VolID        DD 0xa0a615c
    BS_VolLab       DB "ISHIHA BOOT"
    BS_FileSysType  DB "FAT32   "



    entry:  

            MOV AX, 0 
            MOV DS, AX   
            MOV ES, AX
            MOV BX, AX
        MOV SP, 0x7c00
    prepare:
            STI     ; BIOSがSTIし忘れていても大丈夫なために
                MOV     [drv],DL ; 起動ドライブ番号がDLに入っている(BIOSがDLに入れてからMBRを起動するので)
                CMP     DL,0x80
                JB      error    ; HDD系デバイスでなければエラー
                MOV     AH,0x41
                MOV     BX,0x55aa
                INT     0x13
                JC      error
                CMP     BX,0xaa55
                JNE     error
                TEST    CL,0x01
                JZ      error
    readloop:
            MOV  CL, 0
    retry:
            MOV DL, 0x80
            MOV AH, 0x42
            MOV SI, packet 
            INT 0x13
            JNC next
            ADD CL, 1
            MOV DL, 0x80 
            MOV AH, 0x00
            INT 0x13
            CMP CL, 6
            JAE error
            JMP retry
    next:


            MOV AX,[bufferoff]  
            MOV BX,bufferoff  
            ADD AX,0x0200  
            MOV [BX],AX

            MOV AX,[blockNum]  
            MOV BX,blockNum  
            ADD AX,1  
            MOV [BX],AX

            CMP AX, 361
            JB readloop

            JMP 0xc200
    error:
            MOV     SI,msg
    putloop:
            MOV     AL,[SI]
            ADD     SI,1            
            CMP     AL,0
            JE      fin
            MOV     AH,0x0e         
            MOV     BX,15       
            INT     0x10           
            JMP     putloop


    fin:
            HLT                     
            JMP     fin            
    msg:
            DB      0x0a, 0x0a      
            DB      "load error"
            DB      0x0a            
            DB      0


    drv:        DB     0x80
    packet:  
    packet_size:    DB 0x10          
    reserved:       DB 0  
    count:          DW 1     
    bufferoff:      DW 0x0820      
    bufferseg:      DW 0   
    blockNum:       DD 1         
                    DD 0  
            RESB    0x01fe-($-$$)       
            DB      0x55, 0xaa