I enlarged the file to the required size.
Then fixed it with psxt001z
psxt001z by Dremora, v0.20 beta 13 "LibCrypt"
File: 1.bin
Size (bytes): 729736224 (OK)
Size (sectors): 310262 (OK)
EDC in Form 2 sectors: YES
System area: US EDC
Checking data...
Sector 310261: Sync (fixed), Header (fixed)
Subheaders count:
00 00 08 00: 31248
00 00 09 00: 1
00 00 20 00: 151
00 00 89 00: 11
Other: 278851
Form 1 sectors: 190544
Form 2 sectors: 119718
"Bad" headers: 0
Checking postgap...
Postgap type: Form 2
Sector 310259: Form 2 Subheader (fixed), Form 2 EDC (fixed)
Sector 310260: Form 2 Subheader (fixed), Form 2 EDC (fixed)
Sector 310261: Form 2 Subheader (fixed), Form 2 EDC (fixed)
Still the file is not recognizen as a correct dump....