How to mount an external drive?

My external drive, used for Time Machine, is not mounting. I've tried Disk Utilities which sees the hardware but not the partition so I can't Verify or Repair. I've run Disk Warrior but it does not see the drive either. (Also tried zapping SMC and the safe-mode reboot.) Since the drive is showing but not mounting, is it reasonable to assume the hardware is okay, but it is something is messed up with the status/data?
I replaced the previous Time Machine disk about 2 months ago because its 2TB had filled up over 5 years. This one seemed to be working fine then today, poof, it's gone.
Thanks for any advice on next things to try. Failing that, suggestions on a good data-recovery service.
bash-3.2$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *256.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Computer                    255.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                                                   *4.0 TB     disk1
bash-3.2$

Might try a mount from Terminal with
mount /dev/disk1
Or a force mount...
mount force /dev/disk1

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2014-04-20 13:42:08 -0400: Disk Utility started.
2014-04-20 13:44:30 -0400: Preparing to erase : “Terra 8”
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2014-04-20 13:44:30 -0400:           1 volume will be created
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In this case you have to change the drive letter to what it was before.
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Hi,
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Extended Hard Drive Preparation
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How to Clone Using Restore Option of Disk Utility
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Hi Expert,
What are the steps for Mount IBM Tape drive on windows 2008 SAP Platform on Sybase Database ?
After mounting IBM Tape Drive on windows 2008 SAP Platform , can i use this for Sybase Backup purpose from DBACOKPIT ?
Kindly reply me ASAP.

Dear All,
Problem Solved by below activity :-
http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc38421.1572/doc/html/san1335472614455.html?resultof=%22%64%75%6d%70%22%20%22%64%61%74%61%62%61%73%65%22%20%22%64%61%74%61%62%61%73%22%20
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2> go
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Please review any of these SAP Notes to see if you would be able to
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1588316 SYB: Configure automatic database and log backups
1611715 SYB: How to restore a Sybase ASE database server (Windows)
1618817 SYB: How to restore a Sybase ASE database server (UNIX)
1887068 - SYB: Using external backup and restore with SAP Sybase ASE
Configuration DEVDB:
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6> go
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1> sp_config_dump @config_name='DEVLOG' with init,
2> @stripe_dir = "\\.\Tape0" ,
3> @compression = '101' ,
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2> go
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2> go
and
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2> go
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No trouble for a few minutes, then I have to go out.
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Message was edited by: seventy one

Basic Question: How to partition an external drive and then set up TM?

Hi. I am going to be using an external hard drive (Western Digital - 640GB) on my MacBook for the first time and I think that I'd like to partition it so that part of it is for Time Machine and part of it can be used to just manually drag and drop my files (like any other USB external drive).
1. How to I partition the external drive for Mac?
2. If I insert my drive (not yet partitioned) in my MacBook for the first time and the MacBook automatically asks me if I want to use it for Time Machine, I'm assuming that I need to say "no" so that I can first partition it, right? If yes, then after partitioning it how do I set up the one partition for Time Machine?
3. If I have 640 GB external hard drive space and my MacBook has about 100GB of space, how much of the 640 should I allocate for Time Machine?
Thanks! Happy New Year!

coffeecoffee wrote:
Hi. I am going to be using an external hard drive (Western Digital - 640GB) on my MacBook for the first time and I think that I'd like to partition it so that part of it is for Time Machine and part of it can be used to just manually drag and drop my files (like any other USB external drive).
1. How to I partition the external drive for Mac?
select the whole drive (the model, not the name) in disk utility and click on the partition tab. set the number of partitions. set the partition scheme to GUID in options. set the format to mac os extended journaled. hit apply.
2. If I insert my drive (not yet partitioned) in my MacBook for the first time and the MacBook automatically asks me if I want to use it for Time Machine, I'm assuming that I need to say "no" so that I can first partition it, right? If yes, then after partitioning it how do I set up the one partition for Time Machine?
in system preferences->Time machine.
also see TM 101 for basic usage instructions.
http://support.apple.com/kb/HT1427
3. If I have 640 GB external hard drive space and my MacBook has about 100GB of space, how much of the 640 should I allocate for Time Machine?
it depends on your computing habits but it's generally recommended to have TM drive to be at least 2-3 times bigger than the total amount of data you are backing up.
Thanks! Happy New Year!

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