Can't format former Boot Camp partition

I would not recommend it. Instead, disk1s4/s5 can be merged and formatted as FAT, a corresponding Hybrid MBR created and BCA installation (without partitioning or downloading BC software) can be attempted.

hi loner, i've read your Testdisk, but could not understand it. actually what i need to do now?

You do not need Testdisk, unless you want to try and recover the deleted NTFS partition, if it has not been over-written yet.

Since the BCA attempted an EFI install, the following command will create a Free Space partition after merging the parts (disk1s4 and disk1s5) into disk1s4 as Free Space. Please make sure there are no mistakes in picking the partitions, otherwise it may cause data loss if the incorrect partitions are used.

diskutil mergePartitions free BOOTCAMP disk1s4 disk1s5

Here is the help page from the mergePartitions command.

diskutil mergePartitions

Usage: diskutil mergePartitions [force] format name

DiskIdentifier|DeviceNode DiskIdentifier|DeviceNode

Merge two or more pre-existing partitions into one. The first disk parameter

is the starting partition; the second disk parameter is the ending partition;

this given range of two or more partitions will be merged into one.

All partitions in the range, except for the first one, must be unmountable.

All data on merged partitions other than the first will be lost; data on the

first partition will be lost as well if the "force" argument is given.

If "force" is not given, and the first partition has a resizable file system

(e.g. JHFS+), it will be grown in a data-preserving manner, even if a different

file system is specified (in fact, your file system and volume name parameters

are both ignored in this case). If "force" is not given, and the first

partition is not resizable, you will be prompted if you want to erase.

If "force" is given, the first partition is always formatted. You should

do this if you wish to reformat to a new file system type.

Merged partitions are required to be ordered sequentially on disk.

See diskutil list for the actual on-disk ordering; BSD slice identifiers

may in certain circumstances not always be in numerical order but the

top-to-bottom order given by diskutil list is always the on-disk order.

Ownership of the affected disk is required.

Example: diskutil mergePartitions JHFS+ NewName disk3s4 disk3s7

This example will merge all partitions *BETWEEN* disk3s4 and disk3s7,

preserving data on disk3s4 but destroying data on disk3s5, disk3s6,

disk3s7 and any invisible free space partitions between those disks;

disk3s4 will be grown to cover the full space if possible.

Once disk1s4 is Free Space, use the USB with BC and Windows ISO, and reboot and hold Alt Key and select EFI boot. Point the installer to this Free Space entry and install Windows.

what i understand from ur explanation, based on my list. i need to delete disk3 and merge it with disk2 correct?

Johan$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 121.0 GB disk0s2

3: Apple_Boot Boot OS X 134.2 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 749.5 GB disk1s2

3: Apple_Boot Recovery HD 650.1 MB disk1s3

4: EFI NO NAME 104.9 MB disk1s4

5: Microsoft Basic Data 249.7 GB disk1s5

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *864.3 GB disk2

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *32.5 GB disk3

1: DOS_FAT_32 WININSTALL 32.5 GB disk3s1

/dev/disk4

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *1.0 TB disk4

1: Windows_NTFS Seagate Backup Plus ... 1.0 TB disk4s1

/dev/disk5

#: TYPE NAME SIZE IDENTIFIER

0: HRM_CCSA_X64FRE_EN-... *3.6 GB disk5

/dev/disk6

#: TYPE NAME SIZE IDENTIFIER

0: Boot Camp *1.4 GB disk6

Johans-iMac:~ Johan$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 733DDEBE-CA13-41A5-AEC5-02242FD39B98

=========================================================

Name: Macintosh HD

Status: Online

Size: 870502473728 B (870.5 GB)

Free Space: 98304 B (98.3 KB)

|

+-< Physical Volume 938679F7-B1EE-4DCE-BB6A-D98E0438054B

| ----------------------------------------------------

| Index: 0

| Disk: disk0s2

| Status: Online

| Size: 120988852224 B (121.0 GB)

|

+-< Physical Volume 7428B963-323E-4320-AB4E-90B0EA52D6C2

| ----------------------------------------------------

| Index: 1

| Disk: disk1s2

| Status: Online

| Size: 749513621504 B (749.5 GB)

|

+-> Logical Volume Family 17832D68-EA9B-4661-912A-E310ADF8DC8B

----------------------------------------------------------

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume 4527AA97-DD06-43D4-9C7D-1D2E850F643C

---------------------------------------------------

Disk: disk2

Status: Online

Size (Total): 864315506688 B (864.3 GB)

Conversion Progress: -none-

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

ic3johan wrote:

what i understand from ur explanation, based on my list. i need to delete disk3 and merge it with disk2 correct?

No. The following command is what you need.

diskutil mergePartitions free BOOTCAMP disk1s4 disk1s5

Johans-iMac:~ Johan$ diskutil mergePartitions free BOOTCAMP disk1s4 disk1s5

The chosen disk does not support resizing.

Do you wish to format instead? (y/N) y

Merging partitions into a new partition

Start partition: disk1s4 NO NAME

Finish partition: disk1s5

Merging partitions encountered error "Couldn't read partition map (-69876)".

The erase will not occur.

Johans-iMac:~ Johan$

hi loner, it failed. any move? ty

Please try

diskutil eraseVolume free BC1 /dev/disk1s4

diskutil eraseVolume free BC2 /dev/disk1s5

These may not work because they are slices of a PV that is part of a CS volume. This is to leave your OSX LV untouched.

Last login: Mon Jan 5 02:11:53 on ttys000

Johans-iMac:~ Johan$ diskutil eraseVolume free BC1 /dev/disk1s4

Started erase on disk1s4 NO NAME

Unmounting disk

Error: 2: POSIX reports: No such file or directory

Johans-iMac:~ Johan$ diskutil eraseVolume free BC2 /dev/disk1s5

Started erase on disk1s5

Unmounting disk

Error: 2: POSIX reports: No such file or directory

Johans-iMac:~ Johan$

erms

Try /dev/rdisk1s4 and /dev/rdisk1s5. The worst case scenario is a backup, erase and restore.

Last login: Tue Jan 6 21:05:14 on console

Johans-iMac:~ Johan$ /dev/rdisk1s4 and /dev/rdisk1s5

-bash: /dev/rdisk1s4: No such file or directory

Johans-iMac:~ Johan$

i think we should go backup, erase and restore.

Please try

diskutil eraseVolume free BC1 disk1s4

diskutil eraseVolume free BC2 disk1s5

or

diskutil eraseVolume free BC1 /dev/rdisk1s4

diskutil eraseVolume free BC2 /dev/rdisk1s5

Last login: Tue Jan 6 21:05:57 on ttys000

Johans-iMac:~ Johan$ diskutil eraseVolume free BC1 disk1s4

Unable to find disk for disk1s4

Johans-iMac:~ Johan$ diskutil eraseVolume free BC2 disk1s5

Unable to find disk for disk1s5

Johans-iMac:~ Johan$ diskutil eraseVolume free BC1 /dev/rdisk1s4

Unable to find disk for /dev/rdisk1s4

Johans-iMac:~ Johan$ diskutil eraseVolume free BC2 /dev/rdisk1s5

Unable to find disk for /dev/rdisk1s5

Johans-iMac:~ Johan$

owh my haha

Is the current size of your OSX volume less than 120GB? You can right-click on "Macintosh HD" choose "Get Info".

http://i289.photobucket.com/albums/ll228/johan1111/ScreenShot2015-01-07at10538AM .png