Bringing a HDD online in Disk Mgmt does what to the MBR of that drive?

dangerdred

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I needed to copy files between two PCs and didn't have a USB big enough so I took the HDD out of my Dell Vista laptop and used it as an external drive to transfer the files I needed moving. When I connected it up to the destination PC running windows 7, the drive couldn't be seen in explorer. I had to bring the drive online in Disk Management in order to be able to explore the drive and take the files I needed off of it. All was OK until I put the drive back in the Vista laptop and then found that the drive wouldn't boot. All I get is a blinking cursor after the initial Dell logo screen. like as if the BIOS can't load the drive or something.

Can someone please tell me what bringing a drive online in Disk Management does to the MBR of that drive?
 

My Computer My Computer

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Windows 7 Ultimate N x64
OS
Windows 7 Ultimate N x64
I wouldn't think that simply attaching a drive to another PC and looking at it in disk management would do anything to the drive.

Did you do anything other than assign a drive letter to it?

What files did you take off of it? Did you move them off or copy them off?
 

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Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
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PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
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Windows 7 Home Premium SP1, 64-bit
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Intel Skylake i5-6600K, not overclocked
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AsRock Z170M Extreme 4, micro ATX
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8 GB HyperX DDR4-2666 (2 x 4 GB)
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none; graphics are integrated on CPU
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onboard: Realtek ALC1150; external: USB Behringer UF0-202
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System: Crucial MX100 series SSD, 128 GB;
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Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
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Rosewill SilentNight 500 watt fanless, semi-modular
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Microsoft 200 6JH-00001 USB
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Microsoft Security Essentials and Malwarebytes Premium
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All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
When I hooked up the drive there were no letters assigned to the 4 partitions on it. When brought it online they were all assigned letters and then I could access it. I copied one 4.5GB file off it. I wasn't just a case of right clicking on a partition in Disk Management and assigning a letter to it. I had to bring the drive online by right-clicking on the drive itself and click 'Online'. Somebody was telling me that the drive might have been classed then as external storage by the windows 7 OS and did something to the MBR of the drive.
 

My Computer My Computer

At a glance

Windows 7 Ultimate N x64
OS
Windows 7 Ultimate N x64
This was an internal drive on the original laptop.

You say you took it out and "used it as an external drive".

Do you mean you put it into an enclosure and used an external port? I don't use external drives, so if you did that, I don't know what might have occurred.

I'm also not familiar with "bringing a drive online".

Or did you connect it directly to an internal port on the second PC?
 

My Computer My Computer

At a glance

Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
Apologies for the lengthy post...

I took the HDD out of a laptop and connected it up to another laptop via USB. The OS installed the necessary device drivers on connection but when I went to read the files on the disk I saw that the drive wasn't showing in My Computer.
I opened Disk Management and could see the drive listed but there was an exclamation mark displayed on the Disk name. When I clicked on it it opened a help article about having to import foreign drives into windows and bringing them online. I closed down the article and went back to Disk Management and when I right-clicked on the Disk Name, I had the option to bring the disk online. I did this and then all the partitions on the disk were assigned letters in Disk Management and the partition information was displayed. The disk could now be read in explorer so I copied my file off of it and then shutdown the laptop.
I disconnected the drive and put the drive back in my Dell Vista laptop, but The drive wouldn't boot. The initial Dell screen loads and then just a black screen with a blinking cursor. I have a feeling that bringing the drive online has done something to the MBR of the drive. Does anyone know if this is the case?
 

My Computer My Computer

At a glance

Windows 7 Ultimate N x64
OS
Windows 7 Ultimate N x64
I'm also not familiar with "bringing a drive online".

Does this help explain the term "online"?

To reactivate a dynamic disk by using the Windows interface
  1. In Disk Management, right-click the disk marked Missing or Offline.
  2. Click Reactivate Disk. The disk should be marked Online after the disk is reactivated.
Source: Windows Help
 

My Computer My Computer

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Windows 7 Ultimate SP1 64-BitIntel Core i7 870 @ 2.93GHz8Gb Dual-Channel DDR3 @ 664MHznVidia GeForce GTX 460 1024MB dedicated RAM
Computer Manufacturer/Model Number
HP Pavilion Elite 495UK
OS
Windows 7 Ultimate SP1 64-Bit
CPU
Intel Core i7 870 @ 2.93GHz
Motherboard
MSI 2A9C (CPU1)
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8Gb Dual-Channel DDR3 @ 664MHz
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nVidia GeForce GTX 460 1024MB dedicated RAM
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Realtek HD Audio
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HP2310i
Screen Resolution
1920 x 1080
Hard Drives
1x1954GB Hitachi HDS22020ALA 330 (RAID), 1x1954GB Hitachi External for backup and storage
PSU
460W
Case
HP Elite
Cooling
Air cooled
Keyboard
Logitech K750 solar-powered keyboard
Mouse
Logitech Wireless M180 mouse
Internet Speed
2Mb
Other Info
Pure Avanti Flow Internet Radio with iPod Dock, 64Gb iPod, HP USB Speakers, Sony MDR-V500 Headphones, Sony Vaio F-Series Laptop
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