Shirt Pocket Discussions  
    Home netTunes launchTunes SuperDuper! Buy Now Support Discussions About Shirt Pocket    

Go Back   Shirt Pocket Discussions > SuperDuper! > General

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 08-11-2006, 08:56 AM
RDFrelay RDFrelay is offline
Registered User
 
Join Date: Aug 2006
Posts: 6
Copy Verification

This may be a basic question, but here goes...

When I burn a DVD, Toast will "verify" the copy after the burn is complete.

When the Mac copies a file, does this verification happen automatically?

Another way of asking this is-- can I be certain that the file was copied accurately, or is there a possiblity that the copy is corrupted?
Reply With Quote
  #2  
Old 08-11-2006, 11:58 AM
dnanian's Avatar
dnanian dnanian is offline
Administrator
 
Join Date: Apr 2001
Location: Weston, MA
Posts: 14,923
Send a message via AIM to dnanian
Toast has to verify because CD-ROMs often burn "wrong". Hard drives, on the other hand, have controllers that verify writes. So there's little reason to verify again, because you'll get an error if the wrong was wrong.

(Think about it like saving a file to your drive - Pages doesn't re-check the save, because you get an error if it fails.)
__________________
--Dave Nanian
Reply With Quote
  #3  
Old 08-11-2006, 12:05 PM
RDFrelay RDFrelay is offline
Registered User
 
Join Date: Aug 2006
Posts: 6
Thanks again, Dave. I see, the hard drive controller does the verification step as it writes.

Is it possible for the hard drive controller to believe that the file was copied accurately (i.e., not report an error), but for the copy of the file to nevertheless be corrupted?

I'm trying to determine how paranoid I should be that a file that is backed up didn't get copied correctly. Another way of asking this is, if a copy a file to an external drive, how safe is it to delete the original without checking the copy?
Reply With Quote
  #4  
Old 08-11-2006, 12:18 PM
dnanian's Avatar
dnanian dnanian is offline
Administrator
 
Join Date: Apr 2001
Location: Weston, MA
Posts: 14,923
Send a message via AIM to dnanian
It's always possible for things to corrupt... after all, that's why you need the backup in the first place. But the likelihood is extremely low that it would become damaged immediately upon copy without error.

Critical data, though... remember that redundancy is your friend.
__________________
--Dave Nanian
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
SD! & HDD copy speed fun DaleMeyn General 3 03-20-2006 04:24 PM
Copy error and crash offdahook84 General 3 10-01-2005 10:10 PM
BackUp hangs at 3% JimK General 10 09-27-2005 09:48 AM
Error: No space left on device tradervic General 11 06-29-2005 04:50 PM
When I try to copy a single directory, I end up copying the whole disk. Why? dnanian Frequently Asked Questions 0 06-22-2004 06:59 PM


All times are GMT -4. The time now is 09:15 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.