use "nandwrite" instead of "cp"?

[??]

  dear all,
  thanks for your help,
 
 now i try to:
 
1> eraseall /dev/mtd1
2> cp test.img /dev/mtdblock1 
     (should i use "nandwrite" instead of "cp" here?)
3> mount -t jffs2 /dev/mtdblock1 /mnt
 
 then it still report many "magic bitmask not found"
  do i missing something?
  
  thanks in advanced!:)
  
  best regards,
  kevin
 
>  ----following message
> > log------------------------------------------------------
> > jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00298014:
> > 0xa3dc in
> > stead
> > jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00298018:
> > 0xccfe in
> > stead
> > jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0029801c:
> > 0xd1b5 in
> > stead
> > jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00298020:
> > 0xf8fd in
> > stead
> > jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00298024:
> > 0xb452 in
> > stead
> > Further such events for this erase block will not be printed
> > nand_read_ecc: Failed ECC read, page 0x00007fc0
> > nand_read_ecc: Failed ECC read, page 0x00007fc0
> > nand_read_ecc: Failed ECC read, page 0x00007fc1
> > nand_read_ecc: Failed ECC read, page 0x00007fc1
> > nand_read_ecc: Failed ECC read, page 0x00007fc2
> > nand_read_ecc: Failed ECC read, page 0x00007fc2
> > nand_read_ecc: Failed ECC read, page 0x00007fc3
> > nand_read_ecc: Failed ECC read, page 0x00007fc3
> > jffs2_scan_empty(): Read 0x1000 bytes at 0x00df8000 returned -5
> > mount: wrong fs type, bad option, bad superblock on /dev/mtdblock1,
> >        or too many mounted file systems
> > 
> > 
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>