Lightroom 4 issues with importing external hard drive

i decided start using lr because have mac book air , keep photos on external harddrive.  far have been through 5 corrupted or disappearing catalogs.  have tried storing catalog on local drive , external drive.  both have resulted in failures.  making manual backups , how deleted lightroom (i don't recall ever giving permission delete files randomly)

 

i working osx mountain lion , external hard drive formated ntfs.  have software allows me write drive mac.

 

in last attempt working folder folder not import many files @ single time (never more 500 photos in folder). 

 

every time lr throws useless general error not able search it.  in last failure recieved part of error including of sql.

 

lightroom_fatal_sqlite_transient_error :: database: /volumes/freeagent drive/lightroom catalog/lr catalog v3/lr catalog v3/lr catalog v3.lrcat :: error: disk i/o error :: sql:		select folderid (
				select aglibraryfolder.id_local folderid,
				lower( aglibraryrootfolder.absolutepath || aglibraryfolder.pathfromroot ) path
				from aglibraryfolder, aglibraryrootfolder
				where aglibraryfolder.rootfolder = aglibraryrootfolder.id_local
		)  path = ?;

 

after recieving error lr deleted catalog , manual backups in seperate folder (i still dont know how managed or had permissions that).

 

needless have reached patience limit lr after 3 days of constnaly babying , backuping managed delete backups.

 

has run before, because me makes lr unusuable , cant imagine bad else.

 

thank you.

hi breinhar9911

 

i've never seen case lr has managed delete catalog or backups, sounds odd there.  i've seen cases it's lost track of are, can't think of way lr delete them.  lr doesn't know backups exist!

 

which ntfs on mac software using?  considering how new mountain lion is, that's first place i'd looking odd issues.  i'm no expert in odd error messages, disk i/o error stands out me in message.

 

when you've had catalog on internal drive, failures getting then?

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