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In contrast, a file system that does not preserve letter case will typically store letters in file names either as all lowercase or as all uppercase, and the letter case information will thus be lost. If an attempt is made to create a file named "ThisIsAFile" on a file system that does not preserve
201:
are case-preserving and case-insensitive. Since they are case-insensitive, any combination of lowercase or uppercase letters can be used when referring a file, so that a file named "ThisIsAFile" can be referred to as "thisisafile", "THISISAFILE", "thisISaFILE", and so on. However, since they are
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case-preserving, when a file is created, the file name will be stored in the combination of lower and upper case letters specified, so that if a file is created as "ThisIsAFile", the name of the file will be "ThisIsAFile" rather than, for example, "thisisafile" or "THISISAFILE".
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In a non-case-preserving system, arbitrary capitalization may be used by the system for storage and display, such as for example all letters being store in lowercase (or alternatively all in uppercase). For example, in Oracle
Database, a table created with the name
205:
This means that one cannot save two files with the same name in the same place if the only difference in their file names is capitalization (lowercase or uppercase letters). For example, one cannot have files named readme.txt and Readme.tXT in the same folder.
160:(uppercase or lowercase) of letters in file names. If an attempt is made to create a file named "ThisIsAFile" on a file system that preserves letter case, the file's name will be "ThisIsAFile", rather than, for example, "thisisafile" or "THISISAFILE".
177:
It is possible and common for a system to be case-insensitive, yet case-preserving. This combination is often considered most natural for people to understand, because most people prefer using the correct
277:, are case-sensitive. This means that there can be two files in the same folder whose only difference is capitalization. For example, readme.txt and Readme.tXT can be found in the same folder.
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letter case, the file's name will be "thisisafile" if letters are stored as all lowercase or "THISISAFILE" if letters are stored as all uppercase.
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but will still recognize others. For example, a reference to the "uNiTeD states oF AMERICA" is understood to mean the
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A system that is non-case-preserving is necessarily also case-insensitive.
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Text processing that preserves the original capitalization of text
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which is basically always used with long filename support,
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with various case-sensitivity and case-preservation are:
140:"A" are the two case variants of the first letter in the
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415:"Database identifiers, quoting and case sensitivity"
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391:"Identifier requirements | Snowflake Documentation"
56:. Unsourced material may be challenged and removed.
273:systems other than macOS, such as file systems in
229:names) in some relational databases (for example
186:, even though the capitalization is incorrect.
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265:Case-sensitive (results in case-preservation)
8:
168:Combinations of preservation and sensitivity
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116:Learn how and when to remove this message
371:only when without long filename support
127:
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257:(unless it is created under the name
210:Non-case-preserving, case-insensitive
7:
54:adding citations to reliable sources
14:
173:Case-preserving, case-insensitive
30:
41:needs additional citations for
217:This applies, for example, to
1:
269:Most of the file systems in
189:Most of the file systems in
1629:Filesystem-level encryption
156:is the preservation of the
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476:Comparison of file systems
18:
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1255:
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1579:Extended file attributes
1280:Compact Disc File System
327:(in Unix-like systems),
281:Examples of file systems
184:United States of America
19:Not to be confused with
1678:Installable File System
726:TiVo Media File System
590:Encrypting File System
197:, and all versions of
193:, current versions of
145:
1760:Computer file systems
721:Macintosh File System
131:
1734:GUID Partition Table
1081:Distributed parallel
829:Shared File System (
358:Non-case-preserving
50:improve this article
1739:Apple Partition Map
1685:Virtual file system
1624:Access-control list
738:NetWare File System
65:"Case preservation"
1729:Master Boot Record
1554:Data deduplication
1193:Google File System
1109:Google File System
595:Extent File System
557:Byte File System (
395:docs.snowflake.com
259:"CustomersRegion1"
253:will be stored as
235:Interbase/Firebird
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1544:Case preservation
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300:Case-insensitive
285:Some examples of
195:Microsoft Windows
154:case preservation
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1564:Execute in place
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1270:Boot File System
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419:Lorenzo Alberton
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305:Case-preserving
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255:CUSTOMERSREGION1
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251:CustomersRegion1
142:English alphabet
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21:Case sensitivity
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1477:Self-certifying
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1703:Cryptographic
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1549:Copy-on-write
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1022:wear leveling
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106:February 2024
98:
95:
91:
88:
84:
81:
77:
74:
70:
67: –
66:
62:
61:Find sources:
55:
51:
45:
44:
39:This article
37:
33:
28:
27:
22:
1668:File manager
1543:
1237:
1138:
964:Flash memory
931:Optical disc
869:soft updates
849:Soup (Apple)
499:non-rotating
465:File systems
422:. Retrieved
418:
409:
398:. Retrieved
394:
385:
323:(optional),
287:file systems
284:
268:
247:
216:
213:
204:
188:
176:
162:
153:
150:file systems
147:
112:
103:
93:
86:
79:
72:
60:
48:Please help
43:verification
40:
1634:Permissions
1249:Specialized
481:distributed
361:Impossible
349:(default),
331:(optional)
219:Identifiers
158:letter case
1660:Interfaces
1644:Sticky bit
1524:Versioning
1489:Journaling
1432:Rubberhose
1228:SMB (CIFS)
1020:host-side
424:2024-02-08
400:2024-02-08
378:References
353:(default)
76:newspapers
1519:Synthetic
1462:Clustered
1409:Encrypted
1340:OverlayFS
949:ISO 13490
525:Amiga OFS
520:Amiga FFS
271:Unix-like
243:Snowflake
138:uppercase
134:lowercase
1754:Category
1604:Symbolic
1533:Features
1509:Semantic
1417:eCryptfs
1361:configfs
1330:SquashFS
1218:POHMELFS
1119:OrangeFS
944:ISO 9660
864:UFS/UFS2
812:Reliance
800:ReiserFS
646:Files-11
540:bcachefs
497:Disk and
347:HFS Plus
321:HFS Plus
199:Amiga OS
136:"a" and
1722:Layouts
1708:Default
1371:debugfs
1345:UnionFS
1239:more...
1172:OpenAFS
1140:more...
805:Reiser4
775:OpenZFS
666:HAMMER2
622:ext3cow
602:Episode
90:scholar
1595:Links
1569:Extent
1499:Object
1467:Global
1385:specfs
1381:procfs
1376:kernfs
1354:Pseudo
1335:UMSDOS
1290:Davfs2
1285:cramfs
1223:Hadoop
1203:Lustre
1089:BeeGFS
1055:NILFS2
790:QNX4FS
753:NILFS2
661:HAMMER
651:Fossil
239:Oracle
223:column
92:
85:
78:
71:
63:
1695:Lists
1639:Modes
1484:Flash
1455:Types
1437:SSHFS
1422:EncFS
1399:WinFS
1394:tmpfs
1389:sysfs
1366:devfs
1300:FTPFS
1295:EROFS
1233:SSHFS
1114:OCFS2
1067:UBIFS
1062:YAFFS
1050:NILFS
1045:LogFS
1040:JFFS2
996:EROFS
986:exFAT
891:Xiafs
874:WAPBL
859:UBIFS
770:OneFS
748:NILFS
743:Next3
733:MINIX
639:exFAT
567:Btrfs
535:AthFS
515:AdvFS
369:FAT16
365:FAT12
339:FAT32
275:Linux
227:table
191:macOS
97:JSTOR
83:books
1599:Hard
1591:Fork
1472:Grid
1325:MVFS
1320:NOVA
1315:LTFS
1310:Lnfs
1305:FUSE
1275:CDfs
1265:AXFS
1260:Aufs
1198:GPFS
1183:Coda
1134:Xsan
1124:PVFS
1104:GFS2
1099:CXFS
1094:Ceph
1035:JFFS
1030:CHFS
1011:NVFS
1001:F2FS
991:TFAT
976:APFS
966:and
910:z/OS
901:Xsan
886:WAFL
881:VxFS
854:Tux3
844:SNFS
826:SFS
795:ReFS
765:NTFS
717:MFS
703:HTFS
698:HPFS
693:HFS+
656:GPFS
627:ext4
617:ext3
612:ext2
586:EFS
577:CXFS
572:CVFS
559:z/VM
544:BFS
530:APFS
510:ADFS
351:APFS
343:NTFS
335:VFAT
329:APFS
325:NTFS
317:ext4
313:ext3
241:and
225:and
132:The
69:news
1442:ZFS
1427:EFS
1213:NFS
1208:NCP
1188:DFS
1178:AFP
1168:AFS
1155:NAS
1129:QFS
1006:JFS
981:FAT
968:SSD
954:UDF
939:HSF
920:Sun
916:ZFS
906:zFS
896:XFS
822:RFS
785:QFS
780:PFS
760:NSS
713:LFS
708:JFS
687:MVS
683:HFS
673:HFS
634:FAT
607:ext
582:DFS
309:UFS
231:DB2
148:In
52:by
1756::
1163:9P
831:VM
417:.
393:.
367:,
345:,
337:,
319:,
315:,
311:,
237:,
233:,
152:,
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1170:(
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675:(
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457:e
450:t
443:v
427:.
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144:.
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113:(
108:)
104:(
94:·
87:·
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73:·
46:.
23:.
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