Why can I only use 2.48 GB RAM in Boot Camp (Win 8.1 Pro, 64-bit)?

That worked, I can access disk0 again. Now the external optical drive is connected, the original Windows DVD is inserted, I click on BURN in DU and then what? It wants me to select a file, what am I supposed to select?

I click on the optical drive with the Windows DVD, I click on restore, chose the destination (which is the small partition of disk0) and then I click on restore. That results in: Restore failure. Could not validate source - error 254

I was following those steps:

Restore a disk image with a single partition to a disk

1. Select a disk in the sidebar, then click Restore.
2. Drag the disk image to the Source field.You can drag the disk image from the list at the left, the Finder, or a web browser.
3. Drag the disk that will hold the contents of the disk image to the Destination field.
4. Click the Restore button.

I tried the following afterwards:

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *1.0 TB disk0

1: Windows_NTFS 1TB Boot 10.1 GB disk0s1

2: Windows_NTFS 1TB Windows 990.1 GB disk0s2

sudo dd if=/Users/MSSD/Win81.iso of=/dev/rdisk0s1 bs=1m

which resulted in

4991+1 records in

4991+1 records out

5234294784 bytes transferred in 47.563281 secs (110049069 bytes/sec)

The problem is: it's not on the 1TB partition (which is disk0s1).

It is mounted, however after using the terminal command the name of the partition is changed to disk0s1 and then when I want to do anything with it I got "resource busy". After reboot I can access it again.

Maybe the RESTORE idea is worth looking further into, the SuperDrive starts for a moment but then this error 256 appears.

Why is it so hard on a MAC to boot from something else than the internal SuperDrive or the hard disk?

I'm sorry, I have no idea what you're talking about. What would be the complete command I have to type in the terminal?

My "boot partition" is disk0s1

And I put the .iso file on that boot partition, not the files in the image? I read it 100 times that you cannot put an .iso image on a stick or hard drive and boot from it.

maybe I misunderstood.

1) How is disk0 supposed to be formatted? MBR OR GUI? (I keep reading you can't boot if it's not GUI).

2) How are the partitions (small 10 GB Boot and the big one) supposed to be formatted? FAT is out of the question because of the file limitation, so it's either exFat or NTFS (I have Tuxera).

3) Do you want me to copy the .iso file on the small boot partition or mount the ,iso and then copy the files?

Ok, right now this is how my internal drive looks:

Disk Description : ST31000528AS Media
Total Capacity : 1 TB (1,000,204,886,016 Bytes)

Connection Bus : SATA
Write Status : Read/Write

Connection Type : Internal
S.M.A.R.T. Status : Verified

Partition Map Scheme : GUID Partition Table

Mount Point : /Volumes/Windows Capacity : 999.99 GB (999,993,376,768 Bytes)

Format : ExFAT
Available : 994.72 GB (994,716,024,832 Bytes)

Owners Enabled : No
Used : 5.24 GB (5,244,846,080 Bytes)

Number of Folders : 0
Number of Files : 40,015

Back to question number 3:

How / what do you want me to copy on there? The .iso file? The single files? Just copy & paste in the finder?

The DD / restore didn't work before.

Please explain step 4. What are the parameters of the fidisk command?

The 10 GB partition is disk0s2

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Microsoft Basic Data 1TB-BOOT 10.1 GB disk0s2

3: Microsoft Basic Data 1TB-WIN 989.9 GB disk0s3

Let's get back to that a little later please. I was still at the previous step, I ran the fdisk command, I didn't use bless but after the reboot for the first time the Windows setup came up. However I couldn't install Windows because now I get the error message that it cannot be installed on the big partition since it's MBR and not GUID.

Here is the output of the fdisk command:

Disk: /dev/disk0 geometry: 121601/255/63 [1953525168 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

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

*1: 07 1023 254 63 - 1023 254 63 [ 2 - 19793400] HPFS/QNX/AUX

2: 07 1023 254 63 - 1023 254 63 [ 19793403 - 1933731765] HPFS/QNX/AUX

3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

Ok, I will try this again but do I create the second (big partition) after step 2 or 3 or later after the reboot?

The bless command - the disk0s is 1 (small) or 2 (big partition)?

1. Disk is GPT.

2. Create a 4GB exFAT partition.

3. Copy the contents of W7 ISO to this partition. The installer should not have files larger than 2GB.

4. Use Fdisk to make this partition bootable.

5. Use bless

sudo /usr/sbin/bless --verbose --device /dev/disk0s3 --setBoot --legacy --nextonly

6. Restart (first time I had no bootable device which was corrected with steps 4 and 5).

Is that the correct use of the fdisk command (if not please advice):

Setting Your Partition "Active" Using Fdisk

Words in bold below are things you must type (followed by Enter).

1. Boot your Mac OS X install dvd

2. Once the installer is running, go to the Utilities menu and open Terminal

3. Determine which disk your MacOSX partition is on

Type diskutil list

Verify which disk number holds your partition (disk0, disk1, etc.)

4. Start using Fdisk

Assuming the MacOSX disk is the first disk ("disk0"), then
type fdisk -e /dev/rdisk0 <== use "rdisk" with your disk number here !!

Ignore the error "fdisk: could not open MBR file ..."

5. Determine which partition for MacOSX needs to be set "Active"

Type p

Verify which partition is for MacOSX (1, 2, 3, etc.)

6. Set the partition "Active"

Assuming it is partition 1, then
type f 1 <== use your partition number here !!

7. Save and exit

Type write

Type y (yes you are sure)

Type exit (to quit)

8. Remove the install DVD and reboot