Thank you for sending your E-mail inquiry.
With regards to your query, I understand that the subject drive is inaccessible on another computer.
Note : Seagate do not support connecting Internal drives via USB External Enclosure.
However, if your Seagate PATA drive is not detected when connected via USB using External Enclosure, put the jumper on 'Cable Select' and check if it is accessible.
Else remove the jumper to make it a slave and try connecting the drive directly to the computer, if it is accessible then the drive is fine.
Please make sure that the drive is formatted according to the required file file system on that computer.
Title: PC and Mac File Systems Overview
URL:
http://seagate.custhelp.com/cgi-bin...std_adp.php?p_faqid=2581&p_created=1129932431
If you want to use the drive on mac, please follow the steps provided in the following URL to format your drive on MAC: Title: Formatting an Internal or External hard drive using Mac OS
URL:
http://seagate.custhelp.com/cgi-bin.../std_adp.php?p_faqid=492&p_created=1004653781
Still you want to work with the drive being connected via USB and if it is not detected please contact the External Enclosure vendor.
If this does not solve the issue please contact our Online Technical Support for further assistance. Due to the nature of your particular problem and the need for interaction, contacting Seagate directly via telephone will provide you with a quicker and more appropriate resolution to your issue.
Seagate technical support agents are available to assist you between 6:30AM and 9:30PM CST, Monday - Friday at 1-800-SEAGATE
(1-800-732-4283).
If you have any additional questions, please let me know.
Thank you,
Abraham Smith
Seagate Technical Support.
1-800-SEAGATE
http://www.seagate.com