| Tot | : | 256^31 | |||
| OK | : | 1 | ( | 0.0% | ) |
| W2 | : | 256^31-1 | ( | 100% | ) |
- 1st char set to 0x00 is sufficient (p.23)
- However implementations are clearing the whole slot.
Determining slot type
- Check DIR_Name[0] / LDIR_Ord
if 0 (1/256) : See Empty slot
else (255/256) goto 2 - Check (L)DIR_Attr
if invalid (1/4) see Invalid attributes
if unknown (7/32) see Unknown attributes
if ATTR_LONG_NAME (1/64) see Long names (long entry)
if ATTR_VOLUME_ID (1/64) see Volume-ID (short entry)
if ATTR_DIRECTORY (1/4) see Directories (short entry)
else (1/4) goto 3 - Check DIR_Name[0] / DIR_Attr / DIR_FstClusLO
if 0xe5 / 0x00 / 0x0000 (1/255*1/64*1/65 536 = 1/1 069 547 520) see Linux-erased long name (long entry)
else (1 069 547 519 / 1 069 547 520) see Files (short entry)
Empty slot (0.4%, 1/256)
Invalid attributes (24.9%, 255/1024)
| Tot | : | 255 x 64 x 256^30 | |||
| Err | : | 255 x 64 x 256^30 | ( | 100% | ) |
- (p.33)
Unknown attributes (21.8%, 1785/8192)
| Tot | : | 255 x 56 x 256^30 | |||
| W2 | : | 255 x 56 x 256^30 | ( | 100% | ) |
- According to (p.33), these are volume labels.
- According to (p.22), these aren't.
According to (p.22), a label has only ATTIBUTE_VOLUME_ID set,
and it is more consistent as long names aren't volume labels but
also have ATTRIBUTE_VOLUME_ID set.
Long names (1.6%, 255/16384)
| Tot | : | 1.8 x 10^75 | |||
| OK | : | 4.2 x 10^66 | ( | 2.3 x 10^-9 | ) |
Tot : 255*4*256^30
OK : 16 448 637 805 799 218 987 180 166 082 690 302 895 038 357 818 732 359 384 680 088 903 * 1 * 1 * 256 * 1
Volume-ID (1.6%, 255/16384)
| Tot | : | 1.8 x 10^75 | |||
| OK | : | 1.2 x 10^51 | ( | 6.7 x 10^-25 | ) |
- DIR_Name might contain spaces without a warning
- DIR_FstClus must be 0 (p.24)
- DIR_FileSize must be 0 (not in spec ?)
Tot : 255*4*256^30
OK : 31528019073332790943547392 * 1 * 1 * 38 139 895 010 575 468 515 643 200 * 1 * 1
Which dates / times really are defined ?
Directories (24.9%, 255/1024)
| Tot | : | 2.9 x 10^76 | |||
| OK | : | 2.1 x 10^70 | ( | 7.4 x 10^-7 | ) |
| W1 | : | 5.4 x 10^72 | ( | 1.9 x 10^-4 | ) |
Tot : 255*64*256^30
OK : 30 337 028 493 752 722 493 440 002 * 16 * 1 * 38 139 895 010 575 468 515 643 200 * 2^28 * 2^32
W1 : 30 337 028 493 752 722 493 440 002 * 16 * 255 * 38 139 895 010 575 468 515 643 200 * 2^28 * 2^32
Linux-erased long names (0.0%, 1/2^32)
| Tot | : | 256^28 | |||
| OK | : | sum(i=1..13,65 534^i) x 256 | ( | 0.4% | ) |
| W1 | : | sum(i=1..13,65 534^i) x 255 x 256 | ( | 99.6% | ) |
| Err | : | (256^26 - sum(i=1..13,65 534^i)) x 256 x 256 | ( | 0.0% | ) |
- Slot[0] = 0xe5 and Slot[11] = Slot[26] = Slot[27] = 0
Files (24.9%, (255*2^22-1)/2^32)
| Tot | : | 2.9 x 10^76 | |||
| OK | : | 2.1 x 10^70 | ( | 7.4 x 10^-7 | ) |
| W1 | : | 5.4 x 10^72 | ( | 1.9 x 10^-4 | ) |
Tot : 255 * 64 * 256^30 - 256^28
OK : 30 337 028 493 752 722 493 440 000 * 16 * 1 * 38 139 895 010 575 468 515 643 200 * 2^28 * 2^32
W1 : 30 337 028 493 752 722 493 440 000 * 16 * 255 * 38 139 895 010 575 468 515 643 200 * 2^28 * 2^32
Overall
| Tot | : | 1.2 x 10^77 | |||
| OK | : | 4.2 x 10^70 | ( | 3.7 x 10^-7 | ) |
| W1 | : | 1.1 x 10^73 | ( | 9.5 x 10^-5 | ) |
Tot : 256^32
1 in 10 000 random 32 bytes chunks looks like a valid fat slot. That doesn't look that good... However, keep in mind that the whole sector must be OK. And 10 000^16 = 10^64.
