How do you think that the OS is able to boot up. If there is no Master Boot Record, the bios would be telling you that the OS is missing, or that there is an problem with the hard drive.
"A master boot record (MBR) is a special type of boot sector at the very beginning of partitioned computer mass storage devices like fixed disks or removable drives intended for use with IBM PC-compatible systems and beyond. The concept of MBRs was publicly introduced in 1983 with PC DOS 2.0.The MBR holds the information on how the logical partitions, containing file systems, are organized on that medium. Besides that, the MBR also contains executable code to function as a loader for the installed operating system—usually by passing control over to the loader's second stage, or in conjunction with each partition's volume boot record (VBR). This MBR code is usually referred to as a boot loader. The organization of the partition table in the MBR limits the maximum addressable storage space of a disk to 2 TB (232 × 512 bytes). Therefore, the MBR-based partitioning scheme is in the process of being superseded by the GUID Partition Table (GPT) scheme in new computers. A GPT can coexist with an MBR in order to provide some limited form of a backwards compatibility for older systems. MBRs are not present on non-partitioned media like floppies, superfloppies or other storage devices configured to behave as such.:
Computer Type Laptop System Manufacturer/Model Number Toshiba Satellite C850D-st3nx1 OS Linux Mint 17.2 CPU AMD E1-1200 APU with Radeon (tm) HD Graphics 1.40 GHZ Memory 12GB Graphics Card AMD Radeon™ HD 7310 Graphics Sound Card Realtek HD Monitor(s) Displays LCD Screen Resolution 1366 x 768
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No I mean is will MBR work? I know that it could use GPT but I need to be able to use MBR for my External drive.
At this point, your issue is not totally clear. Is this a new external drive you are trying to configure or is an existing drive that cannot be detected for some unknown reason? In any event, try plugging it in and give us a screenshot or (if new), just format it (right click in disk management) as a simple volume in disk management like so:
So, if there's more to this story that we need to know, please be specific and also identify the external drive make/model number in question (ie, WD Passport, MyBook or external enclosure w/drive make/model number inside).
A existing drive. It is a WDBBEP0010BRD-01 WD My Passport 1TB.
Ok, thanks for that. Now, what is the issue? Again, a screenshot of disk management with the drive plugged in would be helpful. Is it not being detected at all? Please understand you need to provide adequate details.