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Experience report and minor problem installing on iMac 24" Alu / OS X


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I just installed a P128 on an 2007 Alu iMac 24" and so far it all went fine.


Install was done by putting the blank SSD into the machine, booting from the old installation (500GB drive with a couple of partitions) from an USB box, going to DiskUtil. There I made a new partition (journaled) on the SSD and did a per-partition restore (dragging the Snow Leopard partition from the mechanical HD to the source field and the newly created SSD partition to dest). Partition size was about 100GB with about 45GB used.


Copying seemed slower than similar actions previously between traditional HDs but eventually completed and the system booted fine from SSD. Xbench reports awesome throughput so I'm happy.


One thing I notice however is that with a reboot the machine takes about a 15-20 second pause with white screen before the Apple logo appears. I'm not worried about it because I normally just put the machine to sleep, but I thought someone might be interested (or have an idea what could be causing it).


Btw, another nice side effect of using the SSD in the iMac is that I could unplug the HD fan, so the machine is now practically silent (not that I think many people will want to dismantle their iMacs in order to install a new HD).

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Just for the record, here are the Xbench results.


Results 250.89

System Info

Xbench Version 1.3

System Version 10.6.1 (10B504)

Physical RAM 2048 MB

Model iMac7,1


Disk Test 250.89

Sequential 211.02

Uncached Write 261.60 160.62 MB/sec [4K blocks]

Uncached Write 284.08 160.73 MB/sec [256K blocks]

Uncached Read 110.18 32.25 MB/sec [4K blocks]

Uncached Read 394.17 198.11 MB/sec [256K blocks]

Random 309.34

Uncached Write 123.69 13.09 MB/sec [4K blocks]

Uncached Write 367.68 117.71 MB/sec [256K blocks]

Uncached Read 2329.87 16.51 MB/sec [4K blocks]

Uncached Read 589.30 109.35 MB/sec [256K blocks]

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..... and did a per-partition restore (dragging the Snow Leopard partition from the mechanical HD to the source field and the newly created SSD partition to dest). Partition size was about 100GB with about 45GB used.......


Everything is clear except the bold part: would you be so kind to be as clear as you can?

I'm asking 'cause I just did a format on my MBP with P256 (quickformat with DiskUtility), reinstalled the Snow Leopard and restore data with Migration Assistant.

Everything went smooth but that's what i got (xBench):


Sequential 103.38

Uncached Write 69.44 42.63 MB/sec [4K blocks]

Uncached Write 92.73 52.47 MB/sec [256K blocks]

Uncached Read 92.96 27.20 MB/sec [4K blocks]

Uncached Read 363.42 182.65 MB/sec [256K blocks]

Random 297.28

Uncached Write 122.61 12.98 MB/sec [4K blocks]

Uncached Write 345.11 110.48 MB/sec [256K blocks]

Uncached Read 1608.76 11.40 MB/sec [4K blocks]

Uncached Read 561.85 104.26 MB/sec [256K blocks]



.... which is sloooooooower than yours.

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What I did is this (the whole process):


- put SSD P128 into the computer

- put the previous drive into an external USB box

- boot the Snow Leopard CD

- rather than installing, I did choose DiskUtil from the Utilities menu (that menu is an often overlooked thing on the Mac Install CDs)

- created a single ext.journaled Partition on the SSD (via partition tab on the right pane of DiskUtil)

- selected the "Restore" tab on the right

- pulled the new SSD partition from the list on the left to the destination field (the entry for the partition, not the whole drive)

- pulled the snow leopard partition from the USB disk to source

- clicked restore.

- wait for restore to complete

- reboot

- run Xbench :-)


(I may have forgotten a minor steps here, I'm writing this from memory but the point you're interested in is in DiskUtil choosing restore and then draggin a partition entry from the left to source/dest on the right).



Not sure if the process has anything to do with the SSD performance. The SSD drive was fresh from the box and the machine is a full size iMac 2.8GHz.


I really hae no idea what performance to expect on an MBP, but if you haven't done too much, you might want to try a secure-erase via this thread: http://forum.corsair.com/v3/showthread.php?t=81492

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