Currently Being ModeratedJan 8, 2014 3:13 PM (in response to SailBoynz)
What they are doing is simply erasing the disk's Directory - the index which tells the computer where all the files actually are. The original files are there, but without the Directory the computer doesn't know about them and so they can be over-written. From the point of view of doing an installation this is perfectly good enough.
The only reason to erase any more efficiently is for security reasons - if you are going to pass or sell the computer on to someone else you may want to actually erase the files completely. Boot from your install disk and from the Utilities Menu choose Disk Utility. Select the disk in the sidebar, then click 'Erase' in the toolbar. Click 'Security Options' to be offered a range of increasingly thorough erase options in the form of the number or erase passes. A basic level will prevent almost anyone from being able to retrieve your deleted files (it's actually quite difficult even with only a Directory erase). The most powerful should stop even a very determined person from accessing them, but be aware it will take a very long time - possibly some days - and seems hardly necessary.
But as I say if all you are doing is doing a new install for your own use the Directory erase which has already been done is perfectly satisfactory.
Currently Being ModeratedJan 8, 2014 6:46 PM (in response to Roger Wilmut1)
is it possoble that some files are making it to the "new" HD as 22GB being in use with just an operating system install, a chap from spain said that the OSX take less than 10 GB of space and all the bad babits seem to have moved to the new install camera not opening Iphoto when its got that box ticked / trash can be empty, then 2 files get deleted and you do a Secure Empty Trash and there is always 12 files to delete and it can take 2 hours to do that happen every time / there are photos in all images now that were in the prevous HD and should not be there/ often mail stops the LP being shut down and force quit is need/for no aparant reason a window comes up in about 5/6 diferent language telling you to shut down the LP by the power botton immediately / the same pinter that has been connected before the reinstall using the same software disk can see it but can't make it do any thing / moving files between places is so slow. it was this sort of thing that got me to start afresh with a clean HD but it seems some stuff is getting into the "new " HD
Currently Being ModeratedJan 8, 2014 11:45 PM (in response to SailBoynz)
is it possoble that some files are making it to the "new" HD
No. The computer can no longer see the files once the Directory has been erased. The only way to access them is from a data recovery method which involves scanning the entire disk and listing these files by examining them - an extremely slow process. I can't say wht you are having the issues you are, but the erase method isn't likely to be the cause - though if you are concerned you could follow the method I gave above for doing a fuller erase, just to satisfy your mind. It may be that the disk itself is beginning to fail. You could download SMART Reporter which can look for possible indications of impeding failure:
Older free version: http://www.corecode.at/smartreporter_lite/index.html
Or £2.99 in the Mac App Store for the current version:
Currently Being ModeratedJan 9, 2014 5:54 AM (in response to SailBoynz)
you do a Secure Empty Trash and there is always 12 files to delete
This has been a bug since Leopard. When you do a Secure Empty Trash, it completes, but reports - e.g. - 7 items still to delete. Then let's say another time you trash one item and choose Secure Empty Trash, the OS reports that it is deleting - e.g. - 10 items, when there's only one item in the trash! As I say, it's a bug and can be ignored.
Currently Being ModeratedJan 11, 2014 6:57 AM (in response to Roger Wilmut1)
this HD is about 8 monthw old, i did the SMART reporter the latest version, said all was ok.
what do you think about the operating system having taken 22GB of the 500GB that to me says some thing is getting added in on the new HD.?
there are now photos in all images that i lost off the first reinstall and they were on the Iphoto of the previous HD .
This last install i have not plugged any other HD's into LP there are photos of people and places i've never seen before?
I've had the strangest window come up 10 days ago on a safari web page and slight black speck back ground 4/5 the full screen is tell you in 6/7 different language's to shut down now by holding the power bottom down,
no reason, and you can't do anything other than that? any ideas on that sort of bad behaviour.
And i'm the only person that touchs it I live on yacht alone and the Mac never goes ashore
does any of that make sence to you?
Currently Being ModeratedJan 11, 2014 7:01 AM (in response to christopher rigby1)
the HD is about 8 months old , the previous one didn't have the same bug, is it just ramdom who gets it.
Currently Being ModeratedJan 11, 2014 8:04 AM (in response to SailBoynz)
I've had the strangest window come up 10 days ago on a safari web page and slight black speck back ground 4/5 the full screen is tell you in 6/7 different language's to shut down now by holding the power bottom down
This is a 'kernel panic' - a major systerm crash. It's usually, though not always, caused by a problem with connected hardware such as an external hard disk, though it can be caused by a serious software bug. If it keeps happening you need to get a competent service facility to look at it.
22GB doesn't sound unreasonable for the System: when you do an initial install you can expect quite a bit of space to be taken up by the System and any other bundled software.