Does External HD Need to be Empty/New?

Hi, I have a couple friends who are upgrading to Tiger and interested in the Time Machine feature. They have existing firewire drives that have plenty of space for backing up available.
But I was told that when firing up Time Machine, it wants to reformat the HD before continuing.
- Is this mandatory?
- Is there a setting to allow it to use a directory on a HD, or any other way to use existing HD?
It woud seem silly that everyone would need to get a new or clean HD to use this feature. A lot of folks may have drives already that are perfectly usable.
Would partitioning the drive be the answer? Any way to do this without destroying the data currently on the drive (I know there's apps for doing this on a PC).
Thanks!

+But I was told that when firing up Time Machine, it wants to reformat the HD before continuing.+
If a drive has not been assigned to Time Machine it asks to format any new external. There is a cancel button but I recall two posts saying that Time Machine formatted their drive automatically even when told not to. The posters also reported losing data on those drives when using file recovery software.
+Is this mandatory?+
In most instances, probably yes. Nearly all hard drives ship with FAT32 formatting and very few people who use externals for storage bother to reformat them. A Time Machine disk must be formatted Apple Extended (Journaled) with GUID partitioning for Intel Macs and Apple Partition Map for PPC Macs. If the external drive is correctly formatted and partitioned it can be used without partitioning for Time Machine as well as data storage. However, Apple does not recommend this.
+Any way to do this without destroying the data currently on the drive+
There are third party utilities that claim to be able to do this but it would be insanely unwise to attempt it without the data on the drive being backed up and tested. Also, I would seriously doubt this would work unless the drive had the correct partition scheme on it for Time Machine.

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== This happened ==
Every time Firefox opened
== Asks me to update FIrefox.

Some different bugs do get fixed with every update, but most of the time you see an update it's because a security exploit was found.
And rather than wait a month or 2 months like Microsoft does, the Firefox team measures how bad the security exploit is and then based on that decides whether to release an immediate update or wait til the next scheduled release of Firefox, which is usually a month or more away.
This way you're protected from whatever the security problem was. And they usually group a couple of security fixes together before giving the new update. So you just don't get 1 fix per version.
So it's not like: Oops, found a security bug! Let's give everyone a new version now! Uh-oh found another one. Let's give a new version again right now!
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Is it possible to hook a USB external hard drive to an iPad?.....the HD has video on it that I wanna watch on my iPad but don't wanna store it on iPad or iTunes....and way format does the video need to be in to watch on iPad?

There are some wireless external hard drives that can be used with the iPad.
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http://www.macworld.com/article/1153935/hyperdrive.html
On the road with a camera, an iPad, and a Hyperdrive
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Pad2, the new iPad Supported Video Formats & Movie Formats
H.264 video up to 1080p, 30 frames per second, High Profile level 4.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
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Do I need to buy a new external HDD for my Air?

I currently have a 2T External HDD that I have been using with my Windows computer. However, I am having problems using it with my MacBook Air - for example, I can't create new folders on the external HDD when using the Air. I read somewhere that "Mac OSX does not write to NTFS disks" (whatever that means) and that I'll need to "reformat the drive to either Fat32 or HFS" (again, I don't know what this means). I don't want to reformat the drive if that will cause me to lose the files that I already have on my external HDD. So, do I need to buy a new external HDD to use with my MacBook Air?

You CAN with the program PARAGON, however its a bit too much effort, .....external HD are cheap as dirt.
A nice 2TB 2.5" external is $117
I read somewhere that "Mac OSX does not write to NTFS disks"
It CAN, but with another APP as mentioned PARAGON
You dont have to reformat anything,.....options are PARAGON, or another HD (the easy way).
You dont have to buy another HD, however having 2 archives of your vital data you dont dare lose is important.
best options for the price, and high quality HD:
Quality 1TB drives are $50 per TB on 3.5" or $65 per TB on 2.5"
Perfect 1TB for $68
http://www.amazon.com/Toshiba-Canvio-Portable-Hard-Drive/dp/B005J7YA3W/ref=sr_1_ 1?ie=UTF8&qid=1379452568&sr=8-1&keywords=1tb+toshiba
Nice 500gig for $50. ultraslim and perfect
http://www.amazon.com/Toshiba-Canvio-Portable-External-Drive/dp/B009F1CXI2/ref=s r_1_1?s=electronics&ie=UTF8&qid=1377642728&sr=1-1&keywords=toshiba+slim+500gb
2.5" USB portable High quality BEST FOR THE COST, Toshiba "tiny giant" 2TB drive (have several of them, LOT of storage in a SMALL package) $117
http://www.amazon.com/Toshiba-Canvio-Connect-Portable-HDTC720XK3C1/dp/B00CGUMS48 /ref=sr_1_4?s=electronics&ie=UTF8&qid=1379182740&sr=1-4&keywords=2tb+toshiba
*This one is the BEST portable external HD available that money can buy:
HGST Touro Mobile 1TB USB 3.0 External Hard Drive
$88
http://www.amazon.com/HGST-Mobile-Portable-External-0S03559/dp/B009GE6JI8/ref=sr _1_1?ie=UTF8&qid=1383238934&sr=8-1&keywords=HGST+Touro+Mobile+Pro+1TB+USB+3.0+72 00+RPM
Most storage experts agree on the Hitachi 2.5"
FORMAT TYPES
FAT32 (File Allocation Table)
Read/Write FAT32 from both native Windows and native Mac OS X.
Maximum file size: 4GB.
Maximum volume size: 2TB
You can use this format if you share the drive between Mac OS X and Windows computers and have no files larger than 4GB.
NTFS (Windows NT File System)
Read/Write NTFS from native Windows.
Read only NTFS from native Mac OS X
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Native NTFS support can be enabled in Snow Leopard and Lion, but is not advisable, due to instability.
AirPort Extreme (802.11n) and Time Capsule do not support NTFS
Maximum file size: 16 TB
Maximum volume size: 256TB
You can use this format if you routinely share a drive with multiple Windows systems.
HFS+ ((((MAC FORMAT)))) (Hierarchical File System, a.k.a. Mac OS Extended (Journaled) Don't use case-sensitive)
Read/Write HFS+ from native Mac OS X
Required for Time Machine or Carbon Copy Cloner or SuperDuper! backups of Mac internal hard drive.
To Read HFS+ (but not Write) from Windows, Install HFSExplorer
Maximum file size: 8EiB
Maximum volume size: 8EiB
You can use this format if you only use the drive with Mac OS X, or use it for backups of your Mac OS X internal drive, or if you only share it with one Windows PC (with MacDrive installed on the PC)
EXFAT (FAT64)
Supported in Mac OS X only in 10.6.5 or later.
Not all Windows versions support exFAT.
exFAT (Extended File Allocation Table)
AirPort Extreme (802.11n) and Time Capsule do not support exFAT
Maximum file size: 16 EiB
Maximum volume size: 64 ZiB
You can use this format if it is supported by all computers with which you intend to share the drive. See "disadvantages" for details.

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Does External HD Need to be Empty/New?

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