Description:
片面データの最初のファイルが読めない後に別の面に替えると例外発生.
Error Log:

*exception*
dummy -f EW96IjonPno9IzZ6PjQiNC8gejc8Ow==/driver_manager.rb gui_action_start --action=DriverManager::ActionRomRamDumpSBP --drivername=DriverManager::DriverAutoDetector
---- 2024-10-20 21:07:57 +0900; action start  ----
comm.opened:auto
detected by name table control register: DriverDiskSystem
CRC32 5E607DCF
error: can't identify diskdata
eject disk card and insert another side
trace (most recent call last):
    [15] EW96IjonPno9IzZ6PjQiNC8gejc8Ow==/driver_manager.rb:578
    [14] EW96IjonPno9IzZ6PjQiNC8gejc8Ow==/driver_manager.rb:575:in gui_action_start
    [13] EW96IjonPno9IzZ6PjQiNC8gejc8Ow==/driver_manager.rb:569:in start
    [12] EW96IjonPno9IzZ6PjQiNC8gejc8Ow==/driver_manager.rb:534:in gui_action_start
    [11] EW96IjonPno9IzZ6PjQiNC8gejc8Ow==/driver_manager.rb:478:in action_start
    [10] EW96IjonPno9IzZ6PjQiNC8gejc8Ow==/driver_manager.rb:238:in action
    [9] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk2NCchJzwxMjAKMSc8IzAnJgk=/disksystem.rb:162:in workram_read
    [8] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/fdsfile.rb:224:in save
    [7] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:255:in save
    [6] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:222:in outfilename_get
    [5] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:222:in each
    [4] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:227:in outfilename_get
    [3] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:227:in gsub!
    [2] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:227:in gsub
    [1] EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:227:in __sub_replace
EW8JIjonPgk9IzYJPjQiNC8gCTc8Owk=/middlelibrary.rb:227:in __sub_replace
nil cannot be converted to String (TypeError)
---- 2024-10-20 21:08:26.00; end ----