The cd is first quick erased and then writed but when it is
opened and tried to copy that data , it doesn,t copy and shows
an error message-"data cannot be read from sector(sector no. )".
This can be for 2 reasons as you have mentioned 1. CD is
corrupted 2. Drive is unable to write the data correctly
Remedies for them 1. If CD is corrupted change the CD. 2. Drive
is unable to write can be for 2 reasons You have a high speed CD
writing and as speed is high many smaller files are skipped due
to high speed and cannot be read at destination CD-ROM. Use slow
speed of 12x but max of 24x and not more than that. CD Writer is
not fully operating properly and nothing can be done from your
part apart from chnaging the drive or repairing it.  Shabbir
Bhimani