#1
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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? Last edited by ctucker10; 10-18-2008 at 07:50 AM. Reason: typographic error |
#2
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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).
__________________
--Dave Nanian |
#3
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Dave, for clarity's sake, if I have an Intel Mac and a choice of cloning via FireWire or USB, what specifically would make FW the better choice? (I'm still in the PPC environment with a 12" PB, and SuperDuper works perfectly with FW). But, my concerns in moving to the Intel side are comparative speed for incremental backups and reliability. Is the USB alternative just as reliable but slower? Can you elaborate?
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#4
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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.
__________________
--Dave Nanian |
#5
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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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#6
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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.
__________________
--Dave Nanian |
#7
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Dave -
My current Powerbook is PowerPC-based. How do I determine if it supports startup from USB? |
#8
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Please re-read what I said above...
__________________
--Dave Nanian |
#9
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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 |
#10
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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.
__________________
--Dave Nanian |
#11
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Quote:
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. |
#12
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Quote:
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). |
#13
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Thanks. I wasn't aware of that usage of the term 'partition.' So, if I understand your reply, one only has to use an HFS+ drive, or reformat a drive that isn't HFS+-formatted, and all should be well for any SD backups (including their being bootable) - ?
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#14
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No. You need to partition the drive properly for your CPU type (even as a single volume/partition).
__________________
--Dave Nanian |
#15
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Quote:
Disk Partition SchemeDisk:Partition Scheme ratio is always 1:1.Partition 1VolumePartition 2Volume Partition Scheme:Partition ratio is 11 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. |
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