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Multiple Large External Hard Drive Recognition Problem
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Sourin
Newbie
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17. September 2008 @ 06:19 |
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1. Recently, I wanted to clone a 500GB external hard drive using USB2.
2. OS was XP/SP1.
3. After switching on and off the new drive several times, it was
recognized as a local drive.
4. Cloned the HD using Acronis True Image Home.
5. Now the computers (tried with 2 computers at different times)
recognize only one external (e.g. M:,N:,O:,P: or U:,V:,W:,X:),
but not both at the same time.
6. The icon 'Unplug or Eject Hardware' in the tray also vanishes when
I fiddle with the power switches. The icon comes back only after I
I remove one ehd and then fiddle with the switch of the other
ehd. The external hard drives are connected to separate power
sources.
7. However, the computers can recognize one 500GB and one 160GB drives
at the same time(e.g. M:,N:,O:,P: or U:,V:,W:,X:,Y:,Z:) in addition
to 2 normal hard drives (C:,D:,E:,F:,G:/200GB and H:,I:,J:,K:,L:/250GB).
8. Does anyone know about an inherent limitation of the OS or USB2?
Shall be grateful for a solution, or at least for an explanation.
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AfterDawn Addict
4 product reviews
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17. September 2008 @ 08:19 |
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This is all a bit confusing. List all the hard drives you have here, and whether they're internal or external, along with which drive letter they're usually given.
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Sourin
Newbie
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18. September 2008 @ 18:51 |
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Above thread expanded with clear references to drives and drive
designantions:
1. Recently, I wanted to clone one 500GB external hard drive to
another 500GB external hard drive using USB2.
2. OS was XP/SP1.
3. After switching on and off the new external drive several times, it was
recognized as a local drive (My Computer display).
4. Cloned the external HD using 'Acronis True Image Home'. External drive
designations M:,N:,O:,P: and U:,V:,W:,X:.
5. Now, after rebooting, the computers (tried with 2 computers at different
times) recognize only one external (e.g. M:,N:,O:,P: or U:,V:,W:,X:), but not
both (500GB external drives) at the same time. 2 normal (internal) hard drives
(C:,D:,E:,F:,G:/200GB and H:,I:,J:,K:,L:/250GB) are always present.
6. The icon 'Unplug or Eject Hardware' in the tray also vanishes when I fiddle
with the power switches of the external hard drives. The icon comes back
only after I remove one ehd and then fiddle with the switch of the other ehd.
The external hard drives are connected to two separate power sources.
So voltage drop etc. can not be the problem,
7. Alternatively, the computers can recognize two external (500GB and 160GB)
hard drives at the same time (e.g. M:,N:,O:,P: and U:,V:,W:,X:,Y:,Z:)
in addition to 2 normal(internal) hard drives (C:,D:,E:,F:,G:/200GB and
H:,I:,J:,K:,L:/250GB). [This was an alternative trial arrangement].
8. Does anyone know about an inherent size limitation of the OS or USB2?
Shall be grateful for a solution, or at least for an explanation.
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AfterDawn Addict
4 product reviews
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18. September 2008 @ 19:42 |
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Why do you have so many partitions on all your drives? Such a vast number may cause you problems.
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AfterDawn Addict
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18. September 2008 @ 22:12 |
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Originally posted by Sourin:
Above thread expanded with clear references to drives and drive
designantions:
1. Recently, I wanted to clone one 500GB external hard drive to
another 500GB external hard drive using USB2.
2. OS was XP/SP1.
3. After switching on and off the new external drive several times, it was
recognized as a local drive (My Computer display).
4. Cloned the external HD using 'Acronis True Image Home'. External drive
designations M:,N:,O:,P: and U:,V:,W:,X:.
5. Now, after rebooting, the computers (tried with 2 computers at different
times) recognize only one external (e.g. M:,N:,O:,P: or U:,V:,W:,X:), but not
both (500GB external drives) at the same time. 2 normal (internal) hard drives
(C:,D:,E:,F:,G:/200GB and H:,I:,J:,K:,L:/250GB) are always present.
6. The icon 'Unplug or Eject Hardware' in the tray also vanishes when I fiddle
with the power switches of the external hard drives. The icon comes back
only after I remove one ehd and then fiddle with the switch of the other ehd.
The external hard drives are connected to two separate power sources.
So voltage drop etc. can not be the problem,
7. Alternatively, the computers can recognize two external (500GB and 160GB)
hard drives at the same time (e.g. M:,N:,O:,P: and U:,V:,W:,X:,Y:,Z:)
in addition to 2 normal(internal) hard drives (C:,D:,E:,F:,G:/200GB and
H:,I:,J:,K:,L:/250GB). [This was an alternative trial arrangement].
8. Does anyone know about an inherent size limitation of the OS or USB2?
Shall be grateful for a solution, or at least for an explanation.
Without installing SP2, I believe that the size limit seen, is 138GB, or something like that.
There was some software or registry hack that could get it to read larger drives, but I instaled SP2 instead.
Life is good!
GrandpaBruce - Vietnam Vet - 1970 - 1971
Computer: Intel Core i7-920 Nehalim;Asus P6T Deluxe V2
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Sourin
Newbie
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19. September 2008 @ 19:17 |
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Are you referring to the 'EnableBigLba' entry to
the registry? It is already enabled, and the
computer recognizes 500GB and more for internal
hard disks. Even for external USB hard drives
500GB + 160GB are recognized, but 2x 500GB as
external drives behave peculiarly. Connect 3
large external drives, and the OS does not know
which is which.
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