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Windows 7: Benefits of GPT vs MBR Primary and MBR Logical Partitions ?

22 Dec 2014   #31
Rockfella

Windows 8.1 Pro
 
 

Which one is faster?I tried both and felt MBR to be slightly faster than GPT. I don't have crazy drives hence don't really need GPT but my motherboard supports it so went ahead and tried it. It feels slightly slower than MBR. Anyone with any experience using both?


My System SpecsSystem Spec
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22 Dec 2014   #32
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by Rockfella View Post
Which one is faster?I tried both and felt MBR to be slightly faster than GPT. I don't have crazy drives hence don't really need GPT but my motherboard supports it so went ahead and tried it. It feels slightly slower than MBR. Anyone with any experience using both?
Never noticed any difference, but I didn't break out a stopwatch or run benchmarks.

The main reason I'd use GPT is to be able to use all of a large drive and that's much more important to me than whatever miniscule speed advantage MBR might have---if any.
My System SpecsSystem Spec
23 Dec 2014   #33
milindsmart

Windows 7 Home Premium x64
 
 

I'm very surprised that you found a speed difference.... Do you mean boot time? Other than that there should be absolutely no difference.
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24 Dec 2014   #34
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

Quote   Quote: Originally Posted by jumanji View Post
I am an average user , honestly. ( looks, reads very complicated but once you do it you know you can do it and if I can do it then anyone can.)
Why is this any different than MBR? GPT has redundant structures that make it less likely the disk boot sectors will be unrecoverably corrupted than with MBR and your are making it sound worse.

Why would you need to save both the primary and backup sectors- you need only save one or the other.

If the data is important, make a backup image or have a copy on another drive. Being able to fix a drive's boot sectors only gives you a sense of false security IMO. If these sectors get corrupted, it is likely your data is ass well.
My System SpecsSystem Spec
24 Dec 2014   #35
Rockfella

Windows 8.1 Pro
 
 

I just felt like that but I was wrong. Some youtube videos suggest GPT is faster so I am using GPT now.
Quote   Quote: Originally Posted by Rockfella View Post
Which one is faster?I tried both and felt MBR to be slightly faster than GPT. I don't have crazy drives hence don't really need GPT but my motherboard supports it so went ahead and tried it. It feels slightly slower than MBR. Anyone with any experience using both?
yeah boot/reboot only. Although I didn't ran a stop watch. Just went by this review:
https://www.youtube.com/watch?v=dQIE5tV2LAs

Quote   Quote: Originally Posted by milindsmart View Post
I'm very surprised that you found a speed difference.... Do you mean boot time? Other than that there should be absolutely no difference.
My System SpecsSystem Spec
26 Dec 2014   #36
alan10

Windows 7 Ultimate 64 bit SP1 x64
 
 

With all due respect, data backups are NOT RELEVANT to the topic in hand,
which is concerned with the relevant merits of GPT and MBR style Disks.

Post #7 indicates how useless GPT can be as a backup because a backup that fails is USELESS as a backup.

I received a Windows 7 Desktop already configured with System C: installed on an MBR Disk because the hardware/BIOS lacked the ability to boot from GPT.

My main use for the GPT disk was to create and maintain on-line Macrium Reflect image backups of C:\,
and to frequently duplicate those backups to USB and eSATA connected disks.

Life is too short to make a backup of every backup of EACH backup.
So I do not waste my time,

One morning Windows woke up stupid,
and decided that the GPT disk had the disk identity of my MBR disk, and put my MBR disk (C:\) offline.

I was able to eventually give the original MBR disk a new identity to replace that which had been stolen,
and put the imitation MBR disk off-line.
Windows does NOT allow me to correct the disk ID of the original GPT DISC, and that puts ALL on-line backups out of bounds.

I needed Lazesoft Data Recovery to retrieve those backups to off-line storage.

I have seen no reason to defer changing my DEAD-OFFLINE Disk to MBR,
and this should avoid any repetition of the same Windows stupidity.

Regards
Alan
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26 Dec 2014   #37
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

From what I have read, it wasn't as simple as your system woke up stupid. You booted to a SysLinux flash drive, it crashed, and when you rebooted you found that the GPT disk was no longer recognized as such. That the flash boot failed is an indication it was doing something stupid. If I had to guess, it would be that the flash boot saw the disk as a damaged MBR and overwrote the partition type of 0xEE and tried to repair it, turning it into a regular MBR. The partition type had to have been changed, and when it did, it was recognized as a valid MBR partition. You may have tried this, but I would beet that if you changed the partition type of the MBR back to 0xEE, you would have recovered your gpt disk.
My System SpecsSystem Spec
27 Dec 2014   #38
jumanji

Windows 7 Home Premium 32 bit
 
 

Quote   Quote: Originally Posted by GeneO View Post
Quote   Quote: Originally Posted by jumanji View Post
I am an average user , honestly. ( looks, reads very complicated but once you do it you know you can do it and if I can do it then anyone can.)
Why is this any different than MBR? GPT has redundant structures that make it less likely the disk boot sectors will be unrecoverably corrupted than with MBR and your are making it sound worse.....
''GPT was designed with improved robustness in mind compared to the older MBR partition table;GPT includes stored CRC values to help utilities spot problems and redundancy to help recover from them. Neither of these features makes GPT completely immune to errors, though; they just help utilities to detect and recover from those problems" - Rod Smith, Author of GPT fdisk- a set of text-mode partitioning tools for Linux, FreeBSD, Mac OS X, and Windows that can also repair/try to repair a broken GPT.

The same author: " An Ounce of Prevention: Before you get into trouble, it's worth taking preventive measures: Back up your partition tables! If you take the simple precaution of backing up your GPT data, and keeping this backup current with any changes you make, you should find data recovery much easier."

This learned author sounds worse than me, an average user !
My System SpecsSystem Spec
27 Dec 2014   #39
alan10

Windows 7 Ultimate 64 bit SP1 x64
 
 

Quote   Quote: Originally Posted by GeneO View Post
From what I have read, it wasn't as simple as your system woke up stupid. You booted to a SysLinux flash drive, it crashed, and when you rebooted you found that the GPT disk was no longer recognized as such. That the flash boot failed is an indication it was doing something stupid. If I had to guess, it would be that the flash boot saw the disk as a damaged MBR and overwrote the partition type of 0xEE and tried to repair it, turning it into a regular MBR. The partition type had to have been changed, and when it did, it was recognized as a valid MBR partition. You may have tried this, but I would beet that if you changed the partition type of the MBR back to 0xEE, you would have recovered your gpt disk.
Where were you when I asked years ago how to turn my disk back to GPT ! ! !
ALL INTELLECTUAL GIANTS AT THAT TIME FAILED TO SOLVE THE PROBLEM.

Please explain how and why Windows would decide that it was appropriate to IGNORE all the good disks,
and deliberately choose to not only re-write a long and complex GPT GUID as a simple and short 8 digit number,
but to ALSO ARBITRARILY USE THE SAME 8 DIGIT NUMBER EMPLOYED by my system C:\ MBR SSD Disk,
and THEN PUT MY SSD OFF-LINE,
and try to boot my trashed GPT disk as C:\ ! ! !

Software such as Macrium Reflect and Hard Disk Analyzer,
AND ALL THEIR COMPETITORS,
were dependent upon disk numbers, and that was good with IDE.
All partition image users had problems once SATA came along,
and Macrium Reflect were the first to overcome the new idiosyncrasies with Windows.

Obviously Windows itself is fundamentally flawed and cannot start up in a predictable controlled fashion.

Yes, I have dabbled with SysLinux
BUT NO -SYSLINUX WAS NOT PART OF THE PROBLEM,
and I cannot find where in this topic you had cause to think it was.

WINDOWS IS STUPID.
It does NOT number SATA disks according to how they are physically connected but in "order of enumeration",
which is MickyMouse speak for "a race hazard we cannot handle - just deal with it."

My SSD is always enumerated last, as number 3,
BUT ONLY when I first switch on the P.C. at the start of the day.
If I ever REBOOT then the SSD is NORMALLY either number 1 or 2.
Further evidence of a STUPID WINDOWS RACE HAZARD.

Regards
Alan
My System SpecsSystem Spec
27 Dec 2014   #40
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

Quote   Quote: Originally Posted by alan10 View Post
Quote   Quote: Originally Posted by GeneO View Post
From what I have read, it wasn't as simple as your system woke up stupid. You booted to a SysLinux flash drive, it crashed, and when you rebooted you found that the GPT disk was no longer recognized as such. That the flash boot failed is an indication it was doing something stupid. If I had to guess, it would be that the flash boot saw the disk as a damaged MBR and overwrote the partition type of 0xEE and tried to repair it, turning it into a regular MBR. The partition type had to have been changed, and when it did, it was recognized as a valid MBR partition. You may have tried this, but I would beet that if you changed the partition type of the MBR back to 0xEE, you would have recovered your gpt disk.
Where were you when I asked years ago how to turn my disk back to GPT ! ! !
ALL INTELLECTUAL GIANTS AT THAT TIME FAILED TO SOLVE THE PROBLEM.

Yes, I have dabbled with SysLinux
BUT NO -SYSLINUX WAS NOT PART OF THE PROBLEM,
and I cannot find where in this topic you had cause to think it was.
DISKPART UNIQUEID Error. Windows reports my GPT Disk as MBR. How do I fix it ?

I found this post (I assume to be yours) looking for failed GPT as I couldn't imagine the scenario you presented. It sounds to me like the smoking gun is the failed Linux boot. Though I suppose it is possible for something to have happened before the Linux boot that made it crash.

Quote:

WINDOWS IS STUPID.
It does NOT number SATA disks according to how they are physically connected but in "order of enumeration",
which is MickyMouse speak for "a race hazard we cannot handle - just deal with it."

My SSD is always enumerated last, as number 3,
BUT ONLY when I first switch on the P.C. at the start of the day.
If I ever REBOOT then the SSD is NORMALLY either number 1 or 2.
Further evidence of a STUPID WINDOWS RACE HAZARD.

Regards
Alan
Windows doesn't use the enumeration to address drives, it uses the disk's signature which is an ID written on the disk and read at boot time. I don't know if windows can do anything about the order that drives are enumerated or if that is a BIOS thing, but it is what it is. It certainly is a pain to diagnose problems I agree. You also have to be careful with programs like DISKPART - that your are operating on the disk that you think you are - or you can clobber a disk that way.
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 Benefits of GPT vs MBR Primary and MBR Logical Partitions ?




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