new MacBook, no FireWire
I don't have a new MacBook yet. I'm just wondering how SuperDuper will work with USB2.0 instead of FireWire400.
Currently I use SD and TimeMachine to backup a 12" Powerbook G4 to two seperate external FireWire drives. TimeMachine everyday, SuperDuper once a week. I'm considering buying a new 13" MacBook. The new MacBooks do not have a FireWire port. Will SuperDuper work reliably via USB2.0 for my weekly Smart Backups? |
Yes. SuperDuper! works fine with USB drives, properly partitioned. The issue is with USB and Power PC-based Macs, which don't support startup from USB.
Intel Macs work fine with USB drives (even though FireWire is better). |
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Specifically, FW maintains speed bidirectionally, and doesn't 'step down' its performance to very low levels when slower devices are connected (because each drive is at least FW400). Bidirectional transfers (read and write) can occur simultaneously, too, at full speed.
On top of that, each FW device is 'smart', and transfers between devices are handled by the device, without mediation by the host. FW 'power' is more reliable and higher, so bus powered devices tend to operate better. Because there are 'more' devices with USB connections, there are more opportunties for bus disruption, slowdowns and failures. Finally, a FW port is a FW port. On laptops and the like, some of the USB ports are 'high power', some are not, and users can get confused. (Yes, there's FW800 and FW400, but they're explicity different ports, even though you can use an adapter.) No doubt there are many other reasons, but those are some off the top of my head. |
Thanks for that information. If I interpret the gist of it accurately, the USB2 port on a new MacBook will work ok with a USB2 external drive (I use bus-powered external for my lappies), but FW would still be a superior connection choice for bootable cloning. Dave, if you were considering a new MacBook, would the lack of FW be a major consideration or even a showstopper based on your experience?
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It's something I care about, yes. But if FireWire vanished from the world tomorrow we'd all have to deal with USB, and I'm sure we all could.
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Dave -
My current Powerbook is PowerPC-based. How do I determine if it supports startup from USB? |
Please re-read what I said above...
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The end of Target Mode?
Right now, I backup between documents partitions on an iMac and a MacBook using Target Mode, instead of using an external harddisk. This way all my Macs have identical documents.
Does the lack of FireWire on the new MacBook mean the end of this workflow? (I'm guessing that there isn't any Target Mode on the new MacBook.) Do you know if there is Target Mode on the new MacBook Pro? Are there any problems backing up using a FW400 to FW800 converter (no more FW400 on any of the new Macs)? Many thanks, Brett |
The USB only MacBooks will not be able to do this, correct. You'll have to use other techniques (for example, use SugarSync or DropBox to syncronize the two folders).
The new MacBook Pro retains FireWire Target Disk Mode, and there's no problem (I've found) with 800->400 cables or adapters. |
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I thought that was only an issue if the user wants the backup to share the drive with other files (?) What does "properly partitioned" mean exactly? Thanks. |
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Partitioning a disk into multiple volumes is one way to store both a system backup and other files (or more than one backup, etc.) on the same drive. Another way is to make backups to disk image files that are stored alongside other files. By "properly partitioned", I suspect that he means that Intel Macs need GPT to be bootable and PPC Macs need APM (Apple Partition Map) to be bootable. Many external drives come partitioned in the MBR (Master Boot Record) style with a FAT-variant filesystem because that is a partitioning scheme and filesystem combination that just about every operating system understands (Windows, Macs, other UNIX and UNIX-like systems, etc.). Just because an OS can read a volume does not mean that the underling hardware+firmware can boot from the volume. I suspect that SD! will backup to/from any volume that is formatted as HFS+ (even one on an MBR partitioned disk). But the target volume will likely only be bootable if the disk is partitioned with the scheme that the hardware requires (this is because the BIOS/OpenFirmware/EFI usually only looks in one partition-scheme-dependent place for booting information). |
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No. You need to partition the drive properly for your CPU type (even as a single volume/partition).
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Disk Partition SchemeDisk:Partition Scheme ratio is always 1:1.Partition 1VolumePartition 2Volume Partition Scheme:Partition ratio is 1:(1 or more). Partition:Volume ratio is always 1:1. For bootable SD! backups, you should use the proper partition scheme for your hardware (GPT for Intel, APM for PPC). And since SD! only works with HFS+ volumes, that is the format (filesystem) you will need to use. Both the partitioning scheme and the format need to be correct for a bootable backup. |
Time and again confusion about the partition schemes.
To be bootable, the disk needs to be partitioned with the right partition scheme for the platform/cpu, even if there is only one single partition. When you check the drive in Disk Utility, information about the partition map scheme is given at the bottom of the Disk Utility window. If you choose to partition in Disk Utility, you will get the option (click "Option" button) to choose between three partition schemes: GUID Partition Table To use the disk to startup Intel Macs Apple Partition Map To use the disk to startup PPC Macs Master Boot record To use the disk to startup DOS and Windows computers |
I need help. I have successfully cloned my HD on the old macbook and have been booting from it for the past two weeks.
today I went and bought the new unibody macbook and I can't get the clone to boot at all. The macbook reboots but will only boot from the hd in the computer not the external. I was going to be cloning the external to the new macbook but I can't figure out what is going wrong. Can you let me know what I am doing wrong??? |
You can't boot a new Macbook from an older Macbook's image: the OS is not compatible.
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Just to see if I've got it right now: I have an unused Maxtor USB HD (OneTouch III Mini Edition -- not Firewire but it should still work) that's pre-formatted for a PC (meaning it's FAT32-formatted, I guess?). So to use it for backups for my Intel MacBook internal HD, I should run Disk Utility and: (i) reformat the Maxtor drive as an HFS+ drive, and then (ii) partition it using GPT (or GUID). And then I'm good to go (i.e., I can actually do the backup) - ? |
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These steps will accomplish both the partitioning (GPT, 1 partition) and the formatting (HFS+). If your backup drive is significantly larger than your system drive, you might want to use more than one partition so you can use the extra space for other data (though you will want to back up this other data to some other device if the data is at all important). If you go with more than one partition, be sure to set the sizes appropriately. Make at least one of the partitions the same size as (or preferably a bit larger than) the volume you will be backing up. |
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I have 23-25 GB to back up on a 60 GB HD. If I partition the drive so that only @ 25GB is reserved for the backup, when the contents of the source drive grow so that I need more space to back it up, will it be possible to re-partition the backup drive without losing the existing backup on that drive? (I know I would have to back up any data in the non-backup partition, since some or all of it would be overwritten by the new backup, but I would like not to lose the existing backup until I'm sure that the new backup has completed without any problems. I also realize I'd have to back up to a different HD once the size of the then-current back up grows to the point that both it and the existing backup will no longer fit on the backup drive.) Also, do separate backups stored on the same hard drive require separate partitions? Thanks again. |
Do not make the partition the same size as the data: that's a huge mistake. Make a 60GB partition. Your data WILL grow: it always does.
You'll need separate partitions for each volume you want to back up. |
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Great discussion guys- I'm learning lots of cool stuff.
Mostly as a matter of curiosity, does SD care whether a given drive is connected via Firewire or USB? For example, my external Maxtor drive has always been connected to my Intel iMac via Firewire. But the Maxtor does have a USB 2.0 port that I'd always simply ignored. If I were to disconnect it from my iMac's firewire port and connect it to a USB port, would SD see the drive same as normal for the purpose of future backups despite the fact that all previous backups had been over firewire? And for that matter, if I cloned the drive over Firewire but later tried to boot over USB, would that work? (assuming of course GPT partition, which it is.) I guess my thinking here is that we are probably seeing the end-of-the line for Firewire, at least in future consumer Macs, so I'm trying to get myself (reluctantly) more knowledgable on USB. Thanks! Kupe |
It shouldn't matter at all.
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The bad news is how slow USB 2.0 is compared to Firewire 400- at least real-world. I transferred the same large file from my Maxtor to my iMac- once while connected by USB and then switched back to Firewire and tried again. I timed them both to the second, and USB 2.0 was almost exactly one-half the speed of Firewire. I simply can't believe Apple is abandoning Firewire (ala MacBooks) in favor of a technology that isn't even nearly as good. Sigh... Kupe |
Yes, that's one of the big problems with USB, and one of the reasons that I don't recommend it. But, it works... and assuming Apple's abandoning it is probably not reasonable. Then again, the market -- which isn't always smart -- has spoken on this particular issue, and what it said was "we only care about how cheap things are".
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Multiple backups on one physical drive
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No, because a partition scheme is global to the drive. You can't partition a drive as both GUID and APM.
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But since the choice of 'partition scheme' is directly linked to which platform the drive will be used on, what advantage does the ability to use different formatting on different partitions actually provide? Thanks. |
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Say you were interested in using a single drive to provide full-fidelity Windows and Mac storage (not bootable, just "native" storage). You could use MBR (or maybe even GPT, depending on the age of the Macs and PCs with which you would like to use the drive) with one or more HFS+ volumes and one or more NTFS volumes. The data on each volume would not be readily accessible to machines with "the other" OS, but it would provide full-fidelity storage for both OS types on a single drive. The goal in such a setup is not sharing data between platforms, but that does not mean that it is a useless configuration. Consider a tech support firm that wants its personnel to be able to carry around a single portable disk that holds the company's normal set of tools for working on Macs (HFS+), PCs (NTFS and FAT32), and Linux systems (ext3). |
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