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Original issue: FDOS#241 Test cases as Script for lDebug files: test$ cat testw1b.sld e 200 "A:\test.dat" 0 f 300 l 400 26 a mov ah, 3C mov cx, 0 mov dx, 200 int 21 xchg bx, ax mov dx, 300 mov cx, 1 mov ah, 40 int 21 mov ah, 68 int 21 int3 int3 jmp 100 . test$ cat testwp1b.sld e 200 "A:\test.dat" 0 f 300 l 400 26 a mov ah, 3C mov cx, 0 mov dx, 200 int 21 xchg bx, ax mov ax, 4200 xor cx, cx mov dx, 200 int 21 mov dx, 300 mov cx, 1 mov ah, 40 int 21 mov ah, 68 int 21 int3 int3 jmp 100 . test$ cat testwpp1.sld e 200 "A:\test.dat" 0 f 300 l 400 26 a mov ah, 3C mov cx, 0 mov dx, 200 int 21 xchg bx, ax mov ax, 4200 xor cx, cx mov dx, 201 int 21 mov dx, 300 mov cx, 1 mov ah, 40 int 21 mov ah, 68 int 21 int3 int3 jmp 100 . test$ cat testw1c.sld e 200 "A:\test.dat" 0 f 300 l 400 26 a mov ah, 3C mov cx, 0 mov dx, 200 int 21 xchg bx, ax mov dx, 300 mov cx, 201 mov ah, 40 int 21 mov ah, 68 int 21 int3 int3 jmp 100 . test$ cat testwp1c.sld e 200 "A:\test.dat" 0 f 300 l 400 26 a mov ah, 3C mov cx, 0 mov dx, 200 int 21 xchg bx, ax mov ax, 4200 xor cx, cx mov dx, 200 int 21 mov dx, 300 mov cx, 201 mov ah, 40 int 21 mov ah, 68 int 21 int3 int3 jmp 100 . test$
The possibility of fragmentation due to this misbehaviour was mentioned in FDOS#245 And it's also just slower to allocate the unneeded cluster just to free it again truncating the file.
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Another take on #241 and a related question in #245 which reads: