"Boot legacy os from whole disk" does not go away

[Fernando Antón Ortega]

Hello!

I tried to search it much time but i do not find it.
I am now desperate, i had windows 10 installed on my mac with everything ok, with refind going ok and all right.

Now i decided to remove windows so i go to disk utility and remove the partition getting my disk only with partition macintosh hd, but when i go to refind it is still showing "boot legacy os from whole disk" and i do not know how to remove it from here :(.

I know that i can simply do not scan the volume but i wish remove it all .
I tried mounting efi but it should be something about mbr boot so i can not do nothing here.

If it helps i can boot ubuntu from usb but i still do not know what to do.

Thank everyone 😔

[Fernando Antón Ortega]

I am lost and i do not know what to do because i am afraid of touching something that will make me reinstall everything 🙄

It is giving me the partition inspector wich come with refit.

*** Report for internal hard disk ***

Current GPT partition table:
 #      Start LBA      End LBA  Type
 1             40       409639  EFI System (FAT)
 2         409640    488965175  Unknown
 3      488965176    490234711  Mac OS X Boot

Current MBR partition table:
 # A    Start LBA      End LBA  Type
 1              1    490234751  ee  EFI Protective

MBR contents:
 Boot Code: Unknown, but bootable

Partition at LBA 40:
 Boot Code: Windows BOOTMGR (Vista)
 File System: FAT32
 Listed in GPT as partition 1, type EFI System (FAT)

Partition at LBA 409640:
 Boot Code: None
 File System: HFS Extended (HFS+)
 Listed in GPT as partition 2, type Unknown

Partition at LBA 488965176:
 Boot Code: None
 File System: HFS Extended (HFS+)
 Listed in GPT as partition 3, type Mac OS X Boot

It is giving me gdisk that is basically the same

nanoMacBookPro:~ nanonandi$ sudo gdisk /dev/disk0
GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): r

Recovery/transformation command (? for help): p
Disk /dev/disk0: 490234752 sectors, 233.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 5122C26C-9526-4D01-B432-A8528C67FA75
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 490234718
Partitions will be aligned on 8-sector boundaries
Total free space is 13 sectors (6.5 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       488965175   233.0 GiB   AF05  Macintosh HD
   3       488965176       490234711   619.9 MiB   AB00  Recovery HD

Recovery/transformation command (? for help): o

Disk size is 490234752 sectors (233.8 GiB)
MBR disk identifier: 0xEF9B9139
MBR partitions:

Number  Boot  Start Sector   End Sector   Status      Code
   1                     1    490234751   primary     0xEE

Recovery/transformation command (? for help): ?
b   use backup GPT header (rebuilding main)
c   load backup partition table from disk (rebuilding main)
d   use main GPT header (rebuilding backup)
e   load main partition table from disk (rebuilding backup)
f   load MBR and build fresh GPT from it
g   convert GPT into MBR and exit
h   make hybrid MBR
i   show detailed information on a partition
l   load partition data from a backup file
m   return to main menu
o   print protective MBR data
p   print the partition table
q   quit without saving changes
t   transform BSD disklabel partition
v   verify disk
w   write table to disk and exit
x   extra functionality (experts only)
?   print this menu

Recovery/transformation command (? for help): 

And finally it is giving me fdisk (but i think it is the same again)

nanoMacBookPro:~ nanonandi$ sudo fdisk -e /dev/disk0
Password:
fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
Enter 'help' for information
fdisk: 1> print
Disk: /dev/disk0    geometry: 30515/255/63 [490234752 sectors]
Offset: 0   Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE 1023 254  63 - 1023 254  63 [         1 -  490234751] <Unknown ID>
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
fdisk: 1> 

I think i need to remove this windows bootmgr (vista) boot code, isn't it? but it says that in gpt this is partition 1 which is efi partition so i do not know why it have windows boot code...

It is frustrating...

[Fernando Antón Ortega]

Okay!! i am so excited!

I could achieve it by booting from external usb with ubuntu and running the comand:

sudo dd if=/dev/zero of=/dev/sda bs=446 count=1

i was afraid about hybrid mbr because i thought that writting zeros on bootstrap code area (i looked for this on wikipedia 😁) would make that the disk do not start but i can see that this did not happen.

Well, finally everything is ok again 😊.

[Roderick W. Smith]

If you're booting no other BIOS/CSM/legacy-mode OSes, you can get rid of them all by uncommenting the scanfor option in refind.conf and ensuring that hdbios is not among the options.